Tallon has a mandate for an internal cap of $65M although he won't admit it. Kovy was likely on his radar until he signed Vrbata, so I think anything involving him is off the table.
NJ would be nutz to trade Henrique for Demers. Tallon supposedly had a deal done in Vancouver to bring back Gudbranson for Demers, which should tell you all you need to know about Demers value at this point. My guess is all it would take would be a 4th to a 7th rounder and Tallon would probably eat $500K of his salary for the next 4 years. But alas I wouldn't get your hopes up as Demers squashed the Gudbranson trade.