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Cheers.
I've found Ambichipboard which looks like it could be installed in as little as 28mm which means i could see a total install height of ~33mm max.
I've done a bit of creative googling and apparently i could do something to connect to existing rad system by introducing a mixer to bring in lower temps but it's all a little above my head for the 10 mins of reading i've done so, if anyone has more info, i'd appreciate it!
Glad to hear i might not be totally mental.
I can have a stab at a couple of them... seeing as I have just had wet UFH installed and will be using Karndean