Thanks for the input and suggestions! I've had the Kemper for only a couple of weeks so I've been studying the manual and discovering it's potential. I'll most likely go with one of those active talk-box units. For stage monitoring I will be using the EV PXM-12MP powered floor monitor which has a couple of inputs, one of which has a dedicated Thru output XLR connector. I plan on using the Profiler MON out to one of the EV inputs for normal monitoring.
I'm thinking I could create a Rig for the talk-box utilizing all necessary EQ, modulation and time-based effects then utilize a post-stack Effects loop module and route it to the talk box via a Send jack. From there I could connect the talk-box mic (I don't normally sing) to the other EV input to monitor the effect on stage and then connect a mic cable to that input's Thru output and send that to the FOH console. I would then have to mute the Kemper Main & Monitor outputs for the rig.
Could work I suppose. Looks good on a bar napkin anyway..