Bumping up an old thread, but I tried something different on last weekend's brew that worked pretty well.
Started off with my HLT (10gal) full. Added ~3.75 gallons of strike water to the MLT and dropped my HERMS coil in the MLT. Recirculated the HLT through the coil while heating to mash-in+10 degrees. Cut the heat, move the HERMS coil back to the MLT. Add the grain, and swap the connections so wort goes through the HERMS coil now. Reset HLT controller to mash temperature + 2F and start recirculating.
The benefit of this is that I've still got a full kettle of hot water for HERMS and for fly-sparging at the end. I'm guesstimating that it only added 10-15 minutes to the initial heating of the strike water.