Hello lovely peeps. Hope everyone is keeping well and still doing lots of wonderful planning for post Covid! Can't wait for the world to reopen

A question for those of you that might have done this.... or will know a little more about it than this Aussie planning an adventure from the other side of the world! I am planning my trip from Columbia to Ushuaia, to Bunos Aires, and then back to Columbia, with the desire to also travel through Central America after tackling the South. From what I've read and researched, Columbia looks to be the best place for a foreigner to legally purchase a bike and obtain everything necessary, and also a good point geographically to hit start on the treck! I've also read that it must be re-sold in Columbia and cannot be sold elsewhere in South America. What I am having trouble finding out, is IF this Columbian bought motorcycle (that will be registered to me) can be taken over to Central America and taken on an adventure through Panama, Costa Rica, Nicaragua, Honduras, Guatemala and part of Mexico? Would I have trouble with authorities and borders as a foreigner on a bike purchased and registered in South America (Columbia). Can I re-sell in Central America or would it have to be done in Columbia?

Just trying to work out how possible it would be to find a bike that I can do as much of the America's as possible. As mentioned, because I'm in Australia.... shipping over my own bike would be an impossible task (and fee). This is my first big overseas trip (on the bike) so any insights or advice anyone could offer would be incredibly helpful and useful. Looking at taking off at the end of the year.....

THANK YOU