Iīve bent rims on almost every bike Iīve had(exceptstrangely enough my old BMW). They were all repairable. You will need to find a shop that can do it. It may look like there are no big bikes but there will be some and somebody will have had the same problem and know where it can be fixed.I canīt help with the rear suspension but hereīs a link to BMW Nicaragua http://www.grupobmw.com/en/bmw_motorcycles.html
they may be able to help. Everyone loves helping a traveler with problems
You donīt have that much stuff Iīve seen people riding alone with more gear and Isabel must weigh next to nothing and youīre not exactly a heavy weight.
There will be a solution and it will be part of the adventure.