Welcome to the world of 40s and non-standard layouts. I’d recommend looking for uniform profile (DSA/XDA/Uniform SA/etc) keycap sets if you don’t care about legend accuracy as it’s a lot easier to mix and match that way (uniform blanks are especially good with crazy layouts). In that case, you would just need to count the number of caps at each size and make sure the set has enough. Unfortunately sculpted sets like Cherry and OEM are not going to be easy to find physical compatibility. edit: if the backspace is 1.5u, I believe https://novelkeys.com/collections/keycaps/products/osa-sleeves will work. but might be worth double-checking
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