I've done this on a few occasions but not with SM there. The wall was already well insulated and I used strips of 5/8" drywall and put the tubing between them with the plates screwed right through to the stud wall.
The finish sheet of drywall was just laminated on with mud, no screws except a few to hold it in place. I've done it with the normal amount of screws too but you have to be careful. These were usually for bathrooms where there was no room for a radiator, due to stupid architects, haha.
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