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That might be the sticking point. Not sure if the Tado extension kit/controller would wirelessly speak to the Nest. If it was wired, I'd be 80% sure it would work as it would just be sending a simple signal. But yes, check the forum. There may be other wireless TRVs compatible with your heatlink though.
Is your nest just your wall thermostat that sends a signal to your heating controller? I'm not 100% sure but you might be able to get the Tado extension kit (not the thermostat) to replace your existing controller then get the TRVs and set those up so they speak to the extension kit. The nest then might just continue to act as your wall thermostat. Tado is compatible with Google Home so you might then be able to control it all through there.
The Tado community forum might be a good place to get a better answer though.