Assign 1379 as real diagonal keys

Ive played a lot of ascii games where instead of pressing 4+8 to go up to the left you can just press 7 (or home i guess) ive been trying my danmdest to figure out a way to do this in ggst but theres no default option and the macro program ive tried dont have an easy way of doing it from what I can tell. If anyone has tried this or has any ideas for it id be appreciative.