Nice! But this would probably shorten to "Becha". A 3-syllable word for "yes" is bound to get shorter with use. (Like goodbye > bye.)I like it! I think a good system for coming up with dialect/language regions would be to think of what some common words might be.
The word Yes
in Minnesotan/Dakotan: Youbecha
I would also think that "yeah" or "ya" would completely replace yes in many languages. Especially in Spanish-influenced regions where "ya" can mean something like "it's done."