With a little negotiating, he could get a new Volvo V60 T6 R-design wagon (what a mouthful). At 302hp it’s not going to be super quick, but at 3900 lbs it’s about 400 lbs lighter than the E63. Big enough to haul everything.
Even better would be the Polestar edition, at 362 hp, but even if you could find a used 2017…