How do you make sure the clutch is engaged? Do you mean just wait a second between shifts?I wouldn't be concerned with the shifting as long as you come to a stop before trying to go from forward to reverse, etc.. Also, make sure the clutch is engaged fully before applying a load (dropping plow into the snow.) Use low as much as practical.
My biggest concern would be weight. Not sure of your location, but it doesn't take much wet snow to overcome the relatively light weight of these machines causing them to spin out. Here in north Idaho, it wouldn't be good for much. My 3/4 Ton pickup with tire chains struggles to keep up.
Since the clutch is centrifugal, I guess it's a good idea to keep the RPM's up while plowing snow?If you listen to RPM's, from a dead stop, you can hear the difference from when it is slipping and then the belt engages. On my 2020 model, it takes a few feet on flat ground. Starting uphill, sometimes longer. Any load under that condition will cause the belt and clutch to build heat.
You don't have to wait between shifts, just make sure the tires have stopped rolling so you don't clash the gears. Mine is gated, so it prevents you from doing it while the transmission is still moving but I'm sure you could force it by accident.