That’s a really good idea. Air down those 2.8”s on the 40 mm i.d. rims for the shoulder season rides and have robust 29” hoops with 2.4” DHF EXO/DHR II DD for rox. (All my flats out here have been of the rear tire so not worried about front casing.)Build some new wheels + DH tires, and save those for winter riding.
I will pull the trigger on this after the next rear flat, which could be in a day or in a season.