Is it possible to change all shortcuts that use command, to use spacebar instead?

On a mac, the command key sits directly under my hand, and I hit it with my thumb. I use Command + c, v, x, a, d, s, etc constantly so my hand is always in this bad position. 

Personally, I never use the hand tool, so it'd be great if to switch everything to spacebar + c etc.  Doesn't seem like this is possible, even though spacebar is a shortcut. Am I missing anything? 

If it's not possible I'm going to look into alt keyboards, but just wanted to check since this would be easiest and cheapest.