So what are the caps *like*?
ABS and pad-printed, probably, but curious. Personally, I think if you got it for basically nothing (which is what I bet a keyboard that looks like that at a thrift store) you have some cool caps you probably *can* use, depending on the style. I am not sure I'd make one with the full set, but depending on what they were paired with, yellow modifiers and the blue BAE would look pretty sweet.
Basically, I'd ditch the alphas and numbers (including the numpad numbers), and the escape and spacebar. Fill that in with a crisp white keyset, especially one with blue legends (and maybe an idiosyncratic escape), you'd wind up with a pretty sweet set of caps on whatever board.
Hell, if they are pad-printed, you can probably find a mild solvent to take off the legends from the particularly ugly. And in any regard, you ALPS switches for parts.