Maybe my brain isn't working right now due to being tired, but what custom enclosure are you referring to? One that I may be able to buy somewhere, (and still have to build) or one that I make out of... aluminum or something? Still really new to this hobby so I don't know what all is sold, and what all people do.
Those empty black panels that you plug switches into, that one member linked seem like a good idea. You could do what I want to do with those. You could use those to mock up any housing you wanted, then build it. Maybe it could even be backlit, I don't know. But would any keys work? I really like those green and orange keys. "Nuclear option" or some such was their name. But I don't know enough about keys, I guess that they'd be somewhat universal or Cherry would have to make all manner of variants of the same switch, just to fit different types and sizes of keys.