good cheap alternatives for a bit of in ear monitoring with that.
If it's just for monitoring the mic plus getting a montior mix from the sound engineer, you could try the Rolls PM50s. I haven't tried it myself, I have the big brother, Rolls PM351, which will also take a mono or stereo instrument as well as provide DI for that instrument. I don't use it with my TC-Helicon unit, though, since I have the VL3X which has a built-in in ear monitoring system. I don't see why it would not work, though. Just plug it in as normal, with the Mic Mechanic before or after the Rolls, depending on whether you want to hear your own voice with or without the effects.