Unless you are aware of known problems w/using the dealership, given that choice, I’d use the dealership. Dealership shop is almost certainly going to have all the needed equipment & experience for the job, plus it’s worth the $800 just for the extra year of warranty.
Still wondering about why this issue develops in the first place; it seems common sense for engine designer to presume the vacuum pump is going to fail at some point, and so they’d design in some sort of fail-safe to prevent damage to the turbo. Maybe easier said than done.