Autohotkey, sharpkeys, and key remapper don't work. Need a workaround or the game is unplayable.

Don't own the game so I can't test (yet) but yozu moght try GlovePie. Does not need any installation and it works similar as AutoHotkey. It's the one program I use whenever I need rebinding in a game that does not support it. Please report if it helpes since without key rebinding to cursor keys I won't buy this game at all.