My first thought was OLKBs Planck or Preonic. There is also a copy cat on AliExpress. I have a Planck and I get super lost in the sauce without having a super different F and J key. The height also kills me without a big wrist rest. I’ve since moved over to a diy board using Choc or the even lower X switches My Board.
I am not sure exactly how that kit goes together, but you can really use anything non conductive. If you take the back plate off you can use a vinyl sticker/tape of any kind. Once you put the back case back on it would do a nice job form fitting and staying even after the tape loses its stick.