Phil
Bob
It looks as if that unit ticks most of the boxes required, compact, has motor & even a valve fitted so as it can be turned off if heat is not needed.
Can't see tha back of it, I expect at worse you'll have to custom create the air ducting behind the dash.
Certainly looks as if it is a fair bit more compact than the old Triumph units I had here ( I belive thy were Smiths units )
Never know, someone on here may have fitted one to a 7