Glad you found a solution that works for you, but ngrok is not for me.

I did look at it before I settled on using RealVNC as an alternative route for what I need. I dismissed it when I looked into the organisation that runs it..and didn't get very far.

I know ngrok is widely used - but there is ...

If you run domoticz on a pi, you can set up the RealVNC server that comes as part of the current pi OS package, create a RealVNC account, then use the free Real VNC client on whatever device you will use remotely, and access via a browser running on the pi.

If you don't run domoticz on a pi ...

Yes - perfectly possible to dim 12v LED's, and quite easy and cheap to do.

I use 2 of these -

https://www.amazon.co.uk/s?k=VIPMOON+2+Pack+11-Key+RF+Mini+Wireless+Remote+Controller+with+DC+Connector+for+Single+Color+3528+5050+LED+Strip+Lights&ref=nb_sb_noss

They control my garden lighting, which ...

Bit late in replying !

I've done this on only one radiator in my house. They all have conventional TRV's, but when remodelling that room, it meant that a desk would be directly in front of and above part of the radiator. The heat output is handled by slots in the desk above it, so the convected ...