First let me say thank you to everyone here for working on this issue. This is going to be my next project that I do with SmartThings and the community experience shared here is invaluable.
In researching parts and what-not I found this little beauty. It uses the DS18B20 so it should simply be a matter of wiring the appropriate connections. Perhaps into one of those cheap Sonoff TH10s as per this thread.
I’m also attracted to this pump. It’s a bit more expensive than the Bacoeng, but it looks right for my purposes (dedicated return line). My only concern would be physical support for the pump since all my plumbing is PEX, but I’m sure I can figure something out.