OK , you know the bike inside out 'cos you've had it so long and worked on it ,therefore you should know what kind of condition it's in ?
Change oils , replace wheel and steering head bearings [ generic brand from a bearing supplier if you can't get Kwacker ones ] .
Check tyres and replace if necessary .
Change plugs .
Carry any small spares you think you might need .
Then go !
Conversely , go to BMW dealer and buy a brand new GS1200 ADV "cos everyone knows that you can't be serious about travelling unless you own one of these .
[and they NEVER EVER breakdown of course ] [ sorry Beemer owners - just me trying to be witty !]
I have just finished putting together a Yamaha XS650 [made up from 2 bikes that I swapped for a Leatherman tool ] .As a winter execise it was fun powder coating and making parts for it ,welding up bits and pieces and changing stuff I didn't like .
Searching the Internet for parts and ideas revealed that there is a subculture that worships these bikes and parts are readily available IF you know where , maybe the same is true for your Kawasaki .
Anyway I intend to do a bit of touring on my sub $1k 1970's Ubiquitous Japanese Twin Motorcycle , mainly just for the hell of it .
The parts bike will sit at home and should I need any big parts they can be shipped out to wherever I happen to be .
So I wouldn't worry about not seeing anyone with a UJM travelling , if I were you I'd just go .
[ no warranty implied - your mileage may vary - preserve nature - wear a helmet - don't drink the water - beware
Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."