Like others have noted, you are probably overthinking this. In my case, it does start out in my heated shop, so it is at 60F+ If I am getting it out now, it is almost certain to be for plowing snow. I let the idle clear up for a bit (20 sec or so) then lift loader & rear blade, pull it out, stop, get out and adjust the rear blade (swung out and angled) and them back in and start plowing. My first pass is straight downhill from there, so i keep the revs in the 1900-2k range for that, but then need more power once I start coming back up, so typically full throttle or close. It warms up nicely with the down pass. Plenty enough to not worry about it.
When I have had it sitting out in the cold it takes longer for the idle to stabilize, so i will let it warm up a little, but I sure wouldn't worry about moving it outside once the idle stabilizes and stops smoking.