Oh man, just note that this is criticism and nothing against you personally. But, this is such a weak interest check.
- "I'm not sure if this has been done before but" There is an easily google-able webpage with most(if not all) previously run GMK sets.
https://matrixzj.github.io/docs/gmk-keycaps- The complete lack of renders and proposed kitting is worrying.
- I admire the fact that you want to make it cheap, but sticking just to a base kit(and maybe spacebars) might reduce the interest to buy outside 60% and up ANSI users(which is the majority I'd admit). This is particularly concerning when the only way you're going to make the set $100 is by having a 1000 MOQ.
- There is no mention of colours codes or chips what so ever. It would do you a lot of justice to look at what Pantone/GMK stock colours these proposed colours would match the best.
- As Lil says - GMK Slashers is already very close in relation to colours. You going to have to do something drastic to differentiate this set.
With that said, GL bud.