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I had something similar. I just wired a netatmo smart thermostat in to replace the existing thermostat as that can be set up with just the two wires (relay plugs in wherever you want).
You should be able to wire the heat link at the boiler and have the nest wireless somewhere. I didn't do that as I didn't want to have a random unused thermostat or blanking plate on my wall where the previous thermostat had been.
Thanks, I'm trying to work out if I can fit a nest myself. I have this over at the boiler....
https://photos.app.goo.gl/YKK7WgEYFaQqkABD7
Do you (or anyone) know if it is as simple as wiring the heat link in the same way then just sticking the nest on a stand?