That’s one reason that I used a grainfather controller. Bluetooth controlled via their app. I just had to isolate the heaters and I wired them up via a plug same with the pumpbut the relays are still under the guten I assume. So it's just the control panel that's corded?
I got a second hand gf controller that had some pixels gone in the screen (grainfather gave me a new screen)
All up cost me about $90 for the upgrade