I would get onto some local UK Vstrom forums. Must be some over there?
In the meantime, start reading as much as you can on forums like Stromtropper.
Stromtrooper.com - Powered by vBulletin
I would keep after various shops until you find someone to help you learn basic maintenance. Got to be someone to help out ... maybe they could put you to work?
On the Vstrom the most you're ever going to have to do is to change tires and change oil/filter. Really, they need very little else ... unless you crash. Still, best to educate yourself about your bike and how basic systems function. You should learn to take off all the body work and put it back on. Pieces come off in a specific order, if you follow this you can strip the bike in ten minutes. (this includes the tank) If you do it wrong you'll break plastic and waste time. Get it right. It's easy.
Your very lucky you've chosen the Vstrom. Great bike. Do you have the DL1000 or DL650?
Both are basic and very simple to maintain. Main weakness as an ADV bike is ground clearance. They have NO mechanical issues. Just nothing to worry about. The F.I. is flawless and should need no attention. The motor is stellar ... easily a 1/4 million mile motor. Trans and electrics all good, suspension could be up graded but you can get by with standard items.
Wheels are tough as nails, so off road is no problem ... within reason. This is no dirt bike but quite capable off road.
Get a Pat Walsh bash plate. Also, fit hand guards. Guards will save your hands ... AND bars, levers and master cylinders. (brake and clutch) in a tip over. Very useful. The bash plate will save your cases going over rocks.
No one will believe this ... but the Vstrom is actually a NO MAINTENANCE bike. Seriously.
Very little needs doing. Even if you never changed oil, The Vstrom wouldn't care. But of course you should
change oil ... but only about every 6000 miles, filter every other oil change.
My two Vstroms (DL1000's), never needed valve clearance adjustments. So set valve clearances to middle of spec (they come on the tight side) and forget them. They will stay in spec for over 50,000 miles ... or forever. I did over 70,000 miles on my '02, only 15K on my '07. Now both sold. I just wanted something different. The '02 valves never moved in 70K.
I took my '02 Strom all through Baja and mainland Mexico. 4 different trips. One into Cent. America. My bike never missed a beat in the 6 years I had it. Hard use and abuse, lots of steady 100+ mph running. (Hard on tires .... but good crossing Nevada or Texas)
You're biggest concern traveling will be tires. But more and more, your sizes are readily available throughout S. America in most countries. I would use TKC80 knobblys for all the Andean countries. This will allow you to go to more rugged interior areas. TKC tires totally transform the Vstrom, making it safe on dirt roads, mud and rocky tracks. Go slow over bumps and dips to avoid banging down.
Resist the urge to overload your bike, even though the Vstrom can be packed up like a Mule. Don't do it. I never camp in Cent. America and very little in S. America. Motels are cheap, safer, easier and much more fun. Treat yourself. Camping takes a big chunk out of your riding day. Setting up/tearing down all take time. Cooking makes no sense, food everywhere locally.
You will need to carry a spare Air Filter ... at least on the DL1000. It's a paper and gets dirty quickly. I tapped mine out a couple times (never use water) and used a air hose to extend its life. But after 15,000 miles it needed changing, so bring a spare one. Some cars uses same paper filter ... find out which.
What the Vstrom needs before setting off:
1. New Battery - Get one from Suzuki - make sure its a sealed MF type
and is properly charged from new. (many numbnuts screw this up) Should last three years even if you run it dead a few times. It will come back to life. Healthy battery is KEY to keeping the Vstrom F.I. systems happy. Luckily its a Suzuki, not a BMW and electrics actually work. Setting off with a used battery is an amateur's mistake. Don't do it.
2. New Chain and Sprockets.
Only one chain to buy: DID 525 VM-2 X-ring, using Rivet link. Use a lesser chain at your peril.
Use OEM Suzuki sprockets. BEST. Cheapest. Carry a spare OEM countershaft Sprocket with you. This set up will take you 25,000 miles easily. I know, I did it. Twice. (Change to new front sprocket at 12K miles)
Keep the chain as clean as you can, but only lightly oiled. No sticky chain lube shit. Ruins chains. Use 90 wt. gear oil. Cheap, available worldwide, cleans up easily. Wipe off daily. Don't oil chain for off road riding.
I'd bring a spare rear, depending on where you start. New front should last 10,000 miles. Tourance, IMHO, is the best road tire ... longest lasting. Conti TKC80's are fantastic, last long, even work OK on pavement. Both of these are expensive but IMO are the two best ones for travel. On the road, get whatever you can find that fits. Mixing tires on the Vstrom is no problem, it does not mind.
Good luck and have fun with your planning and getting some training. It might be worth it to HIRE a Vstrom expert to walk you through your bike.
General knowledge is good, but specific "How To" demos are best.