can i use autohotkey to bind arrow keys to letters I J K L?

deltarune has a config menu

enter a dark world, select the rightmost menu section (has tool imagery), select "controls", and edit keybinds. this will lose some time in a speedrun and anything before you enter the dark world has to use the default binds, but you can still change them to pretty much whatever

Really late reply to this, but yes you can so long as you're not binding more than the standard amount of keys (e.g. you can't have 20 keys that bind to C)