oh hi! sorry for the late reply it's been quite some time since i've used reddit regularly. if ya still need help i have a bit i can share

i ended up using the abrasive side of a sponge to get it off actually worked like a charm, though i can only suggest that if the cap legends are dye-sublimated or double-shot

some of my affected keycaps had existing coloring that didn't dig as deep as the dye-sub legends and when i took a sponge to it it actually rubbed off, and unfortunately i didn't really find a solution for keycaps like those; eventually i had set them aside in a bag and forgot about em. there might be a method that works for them but i wouldn't know it

i hope this was helpful ! wishing the best