Prett set and a great cause you are supporting!
Not sure if someone else spotted it yet, but the row numbers on the numpad seem to be wrong. You have 7,8,9 in R4, but qwerty is in R3. They should be in the same row, and 4,5,6 should be R2, 1,2,3 R1. Probably just an error in the picture, but I wanted to point it out. Good luck iwth the GB!