I would NEVER recommend anyone use a fake affectation of "ye olde Englishe" First of all because nobody seems to get that the Y in Ye is really a thorn and pronounced th. People shouldn't even use it at ren faires.
If you are going to show a language shift, just pull words out and switch their meaning. "Bimbo" was originally a "fellow," ( coined in 1919) by 1920 it was a "floozie," and today no one says "Bimbo" without evoking a strictly female image.
No changes in spelling or pronunciation are needed, no excuses need to be made, you just chose a word and make it mean what you want.
Don't hang a lamp on it.