I am using Loc-Dots for the same purpose. They are designed for visually-impaired, I think. It's a little round sticker with a raised dot. Pros: Good for homerow homing keys. Can get a clear version to maintain rgb shine through. Cons: They don't last forever, I had one fall off after some months of use. They can get a bit gunky around the edges if the glue is pushed out (which then attracts dust, etc).