Gas boiler upgrades

Hi there, I have a Baxi 428 LPG Combi that I’m keen to integrate with HA, or even consider a replacement Heat pump: LPG boiler upgrade wanted

I did notice a rather long and intense thread about integrating IIUC the Baxi Usense Opentherm controller:

I’m not sure if Google Nest is any better, or is there some other solution I should consider?