are these a thing?
https://www.toolstation.com/radiator-valve-extension/p37352
Well who knew...
So theoretically, buy a smaller rad the use extenders to fill the gap?
Yes.
There's also this type which can be used in alone/ in conjunction with the above extenders /cut down to size
https://www.ebay.co.uk/itm/204178653543?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=q-9Xat8pS8C&sssrc=2349624&ssuid=wsQS6kPKSQ6&var=&widget_ver=artemis&media=COPY
@allsop started
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https://www.toolstation.com/radiator-valve-extension/p37352