Yeah, my source (lt1swap.com) says that's exactly what he recommends. Dual speed fans off the Ford Taurus. And he wires them in using those two lo/hi pin outs from the ECU.
See half way down this page:
Wiring Harness Information
'Course I've only got a single speed fan. Hence I'm thinking the low pin would be ok and we just need to program the temp setting. But the fan coming on a bit early it probably better than too late in the interim, methinks!