Hi Neil, just catching up, back of our holiday.

I would expect that the Rear SAM will fix those problems, the only caveat may be it will require Coding as per 55K for the Intercooler Pump and for the Rear Roller Blind, since these were not standard fitments across the board. I hope, but not certain, that this car uses DAS "Version Coding" for that, otherwise you may need to use Vediamo or Developer Mode, because it may be that the guys previously working on the Car swapped the SAM not knowing that and that is why those 2 items aren't working. Normally, if it still communicates we can use the function to copy across the coding, but may not work here.
I recently found all this out on an R Class of similar vintage which was SCN Coded for some functions.

Regarding Crossfires and Chassis Braces, since they are (alledgedly) the same Monocoque structure, one would like to assume that the Bean Counters didn't decide not to weld in all the Chassis Brace's Captive Nut mounts .............. I'd be interested to know the outcome of that unanswered question ?????