You can replace keycap on most keyboards without much issue, though some that have more unique layouts can be more challenging. If you are primarily using for gaming, what kinds of games do you play? If you play lots of RTS or MMO you might find you would rather have function keys. Personally I favor the 60% layouts (Poker, Beetle, etc.) as a gamer and generally don't play games that need anything more than those have to offer on layer1.