I say try it just for the kicks. I do sometimes if getting to that point where i get lots of mf items for hc gf barb... i may use good gear when killing them but then switch 2-3 pieces from cube before magic find. Don't tp out though, corpses disappear.
Or depending on how confident you are in defeating them, you can wear more mf gear. I say, sometimes, more mf% is better than kill speed. Because it's the kick of the big gamble that makes the game fun... not doing a million runs. Better for the brainbox too ^^ A game is meant to be enjoyed, not rushed through.
I.e., if your merc is super strong and geared up, you can equip almost only mf% gear, i did that in hell for a while, only with um'd kira's as no mf item.. it's a bit risky, but fun ^^ You definitely see much more drops. If your merc is strong, he can waltz through them almost every time. And you use the gavel of pain on switch of course, as was my original idea many many years ago, making his job easier. You can use war cry, but it's not very safe when using mf gear, in hardcore. One must be experienced before reducing survival gear to mf gear in hardcore.