Well you might want to change it from "epic monsters" to just monsters as the only epic monsters are Dragons and Baron. 50-70 is a lot early I don't even think raptors deal 50 dmg per AA so he'd literally be immune.
With that out of the way damage reduction to jungle camps sounds like a nice way to help, but a jungle nauts biggest problem is speed and dealing with invades. Most tanks except Sejuani struggle too much with this and doesn't allow them to jungle effectively against "Meta" ones. Sejuani does struggle against some, but she at least has the damage to lash back.
Nauts shield is his primary defensive and offensive mechanic, once down his dueling potential goes to almost 0. Naut would need more movement speed, and either an escape tool or solid damage tool not linked to his shield. Taking damage from the camps is not Nauts problem.
But I'm all for naut buffs however they come lol.