Some keyboard fanatics have created new IBM Model F clones: https://www.modelfkeyboards.com . There has also recently been a glut of original Model F keyboards on ebay, but they take some reconditioning. They make the Model M feel like sponge!
I have a model M. It was not difficult to get Unicomp to send me plain F and J keycaps and U and H with HRI bars, and as you can move the other keycaps easily I now have mine as a UK Dvorak.
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