The 8 wrecked Kinkis that won't be rebuilt have already been combed over for parts donations for the rebuild program, and don't have matching rebuildable A and B ends to be re-mated with like the 4 wrecks that are being rebuilt. There isn't enough to sort through there to Frankenstein up a functioning work car. The T's chance to get some new powered work vehicles to replace the 3 OOS Boeings and fill any new needs comes with the +30 option on the Type 9 contract. If they expand out the new fleet to 54 cars (i.e. the above-and-beyond quantity that would let them institute regular 3-car trains) they'll be able to sideline a few Kinki rebuilds for internal conversion into work cars that'll last a lot longer than the Boeings did in that role.
PCC's have enough kick to push snow just fine. It's the undercarriage layout and propensity for snow getting sucked into the motors that's the problem. Unlike the Orange Line cars where simple hairnets can give the blowers a modicum of protection from ice intake and unlike the Kinkis which seem to be largely impervious to it, however the PCC's are laid out underneath leaves them unusually vulnerable to slurping up snow from below the railhead. That's why they bring in the Snowzilla melters; it's not enough to just plow the ROW down to the railhead, but they actually have to remove all snow straight down to the ties and ballast between the rails and in a car's radius all-around. More plows wouldn't address the exact propulsion issue that's sidelining the cars right now.
The PCC rebuild program is, as part of its top-priority propulsion rebuild, going to install new motor assemblies with real snow protection shielding to lick this longstanding problem for good. Not going to help this winter, but the frequency and duration of these bustitutions should finally be reined in once the rebuilds are done.
In the meantime, a second Snowzilla for the Red work roster would be nice because Red has its own vulnerabilities. And maybe they should think about buying a genset rapid transit work loco to augment the seldom-used Plymouth 50-tonner at Cabot. That can serve as a powered plow when hi-rail or push plow isn't enough, and would be more useful for year-round work than trying to rig up another specialty traction plow car.