Some of the Wyse PCE keyboards (with IBM PC like layout) talk the PS/2 protocol and can be connected directly to a modern PC with or without a simple adapter. Look for model numbers 900840 and 900866.
The key switches in the Wyse keyboards are "Cherry MX Black". There are now loads of new keyboards with the different variations of the Cherry MX (black, red, blue, brown...) -- because they have become popular for computer gaming. One of the first, and now most inexpensive models with blacks, was Steelseries 6GV2 and Steelseries 7G.
Look also for Filco, Rosewill, Leopold, Deck, CM Storm Quickfire and TT eSports Meka [G1], but note that some of them can come with different Cherry MX switches.
Vintage Wyse keyboards are quite popular among keyboard enthusiasts (collectors) these days. However ... they are mainly not after the key action but for the key caps to put on their modern keyboards. The key caps on the keyboards for the Wyse 50 terminals (without cursor keys) were made of thick plastic, but the others are quite good too. Both were double-shot injection molded, so that the legends never wear off.
People also like the vintage colour scheme of dark blue (not black) on grey/dark grey.
In fact, some groups of enthusiasts have made replica key sets. There is a project right now for making an adapter kit with a few missing keys in the vintage style to make them all fit modern keyboard layouts and have the same style.
A while ago, a group of Korean collectors got a full replica set made ... but they botched the colour code for the blue legends when the ordered it so they got light blue instead ... and now there are other enthusiasts who are making a replica of that set, even, hehe.