Really enjoying your report! Thanks much for making the effort!
Can you tell me a bit about what tablet/lab top you're carrying? Comments?

How do you re-fill Data and/or local SIM cards for phone and online use? ... or is it all Wifi? What are costs for local SIM cards or Data? (I'm an Apple user and not very computer literate... obviously!) Do some travelers just buy a local cell phone? Ta for any tips!

Chains!
I'm a chain nut and have spent way too much time and energy fiddling with them. Good to see Neda keeping up on chain maintenance! Daily cleaning/oiling will save lots of heartache down the road.

In wet weather chains can suffer ... and many so called "chain lubes" quickly wash off. I like cheap & cheerful solution: 90 wt. gear oil. commonly available everywhere, cheap. 90 wt. stays on well in rain. Wipe down daily to clean off crud, sand, grit ... then re-oil.

Also, if you have spare front sprockets, highly recommend changing your front sprockets EARLY. Like at around 8 to 10K miles. (12 to 15K kms) This will extend chain life by about 25%. Use quality, OEM sprockets if you can.

BMW are famous for using crap chains on their bikes. LOTS of documented chain failures on GS800 and GS650 forums. If you can, when you replace a chain, try to get a DID VX (or VM) X ring chain. Good for 20,000 miles + (over 30K kms+). (unlikely to find in Latin America)

Meantime, take care of chains-sprockets. A worn front sprocket (it won't look worn to you because you don't know what you're looking at!) will EAT UP your chain prematurely. Front sprocket is first to wear and once worn, its hard on your chain.
Good luck, safe travels!