I was able to check an R12 today. It would not be possible to swap handlebars with the R18. Thread closed.
The R12 is rather quite nice by the way. Still no match for the R18 though.
Not that I know. We have Mexican plated cars here in Houston. I've never seen or heard any problem with it. I know the border is in the news but inland is different. People cross the border both ways all the time. Plus I don't think most people will be able to tell where your bike is from...