Radiator thermostats with pimatic. ZigBee or DECT

Hello everyone, if anyone is still around šŸ¤”,
I would like to exchange my eq3 Heizkƶrpert thermostats for other thermostats. I would also like to change to a different system.
Either ZigBee (a gateway from Dresden Elektronik is available and integrated) or Dect (via the FritzBox), but the prices have risen enormously and the Comet thermostats are apparently no longer available.
Can anyone tell me how I can solve the problem cheaply and feasibly with pimatic?
Greetings to all those who are still here.