I've seen a lot of suggestion threads on how to make heat continue to be rewarding for players with all of their gear at lvl 10. Instead of converting it to crowns, how about this:

At the end of a level, if a player has all of their gear at level 10, what the heat could do is randomly select one of their pieces of equipment that they currently have on them, whether it be a sword, gun, bomb, armor etc. and apply a random UV that lasts for the next level only, AKA temporary UVS. the more heat that you gain in a level, the better UV you acquire for the next level. Now before anyone says exploit abused blah blah blah, well, what if the temporary UVs can only be low or medium, that way if players are heat farming from others that have died several times, they won't be guranteed a Max. UV.

TL;DR make heat apply a temporary UV to one equipped weapon/armor for the next level for people who have maxed out gear.

What do you think? :D