The problem with keyboard stickers is: they only help you, when you look at the keys -but you're supposed to read the notes from the sheet.Perhaps it would be much more helpful having an image of the keys with the names of the notes written on it on the sheet itself.
I teach piano by ear
Steve,you have not seen otherwise healthy 11 years old playing a piano wearing plastic gloves with names of the keys written on it. She has been playing for three years in the same C position. ALWAYS wearing those gloves. I've met her at some point where I thought " I've seen it all". Boy, was I wrong!You are too positive about life, Steve dear .
Well if you decide to use them, make sure you label them correctly. I was somewhere and saw an old piano, and they keys had been labeled with a black permanent marker (ivory keys). Unfortunately they were all off. Middle C was labeled D. All 88 keys were labeled incorrectly.