I know this may sound like a round-about way of doing things, but:
Since you mention liking a retro look, are there any specific older keyboards that you like?
I have found it quite satisfying to buy some (fairly common) older mechanical keyboards and retrofitting e.g. the switches that I liked, or fitting them with a new controller, to get a good, cheap and "classic" keyboard.
But, in any case (no pun intended), it would perhaps be helpful if you could post examples of the kind of thing you like.
Enjoy the hunt!