I've been experimenting with some non-standard keyboards and layouts lately, and I've realized that it's super expensive to buy any kind of keycap set.
If you have a planck, for example, you end up buying a full base set with F-keys, numbers, home/end pgup/down, etc. and then another set with the modifiers, and I would end up with a pile of bright blue keys that I'll never use.
Wouldn't it make more sense for the base set to be a minimal base set, with just alphanumerics, then have a "standard TKL modifiers" set, which add up to be the equivalent of a standard "base set" Those of us who just want a nice set of sculpted SA alphas on an oddball keyboard would be buying a lot less wasted keys, and I expect both the alphas, and the "standard" set would sell in large enough numbers to make little to no difference to the total for a TKL board. The alphas would probably sell better, since lots of us experimental types would probably shell out $40 for a set of alphas, but $80 for the alphas we want, and a bunch of extras we'll never need is just a bit too much when we'll need to fill it out with $25 of blanks.
Modern Selectric was broken down this way, and I'm sure it sold like hotcakes. Why don't others do it the same?