Thanks for the suggestions so far. It sounds like maybe in the short term I'll just run with my current setup and in parallel I'll work on building up a BrewPiLess system when I get a little free time.
@pocketmon - So you would have two temp sensors (one for beer, and one for glycol but assigned as room) and two control actuators (one for glycol pump, one for glycol chilling, but no heater), did I understand that correctly?
@MacDee - I'd be very interested in learning more about your setup (maybe it's the MechEng in me) and hearing updates on how it works out. Maybe you could send a pic of the setup or a schematic if you have one.
@kaljade - If I stick with my current setup, are you recommending just using the one sensor in fridge constant mode, or do you think if I use the beer sensor in the conical thermowell, and fridge sensor for glycol (or between insulation jacket and conical?) with the glycol controlled to just below beer temp then I can run it in normal profile mode?
Thanks again everyone, what an awesome community.