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 have many nice diy Ortho boards for at home, but at work I have a computer I do CAD on. Because I share this machine and use the numpad a lot, and decided to just get a full sized board. Ordered one of the cheap ones with low profile choc switchs from Amazon. Since then I ordered an ISO layout TKL for my wife, and a 65% for my gaming PC. They are the definition of “good enough”. For around the price of one high quality board I now have 3 boards that have been getting daily use and are still “good enough” years later.
To also add, my wife cannot really feel the difference in her cheap low pro, and my lubed Planck. Her only feedback was “Ortho is hard for her, but it looks cool”.
My only suggestion is to ease newer users. If she is used to her GMK67, make sure the layout is the EXACT same. Some smaller boards do weird things with the right shift and arrow keys.