I get what you mean by “bastardisation”. In this case it would be like in my 2nd paragraph: borrow “san” and shoehorn it into the same honorific system English “mister” and “miss” already use, disregarding the one used by Japanese.

But another part of me simultaneously cringes at just, doing that intentionally.

Ah, daijobu. A bit of weebness is omoshiroi.