Looking at the new tools, the 170s require MC to make, so probably no go on using them for MC, and the 180s aren't desynthable. The rest of the green crafted gear takes FC3s, so I don't see any alternative to MCs.

Looks like I can put a dent in the 5 stacks each of rose gold/darksteel/spruce/twinthread/hippo leather that I stocked up in preparation for 3.0.