Maybe that's something for the TO to work out. Large icons on the loading screen would probably be best, however. I don't think it needs to be displayed over the whole match.
Two other points.
1. It was kind of cheap for NRS to tease all these cool moves during the Kombat Kasts and then most of them aren't even tournament legal.
2. We wouldn't even be having these discussions if NRS just ditched the variation system and gave us complete characters with full move lists. Or at the very least, each character had two good variations (and there were no left over casual only moves) that fulfilled different purposes. The problem is the vast majority of the cast only has one good variation, if that. Hell, does anyone really have two good variations? Maybe Jax, Baraka, and Kabal?