This is all a bit beyond me, as I don't work on building sites, and besides, over here we don't have the need to carry a transformer around. You either have grid power ( 95% of the time ) or you don't.
And when working on existing houses, power is always available.
In my experience a dustbag with a planer is a useless acessory. If I have to take of that little, I get a handplane. I don't mind sharpening plane irons, like I don't mind sharpening chisels.
Although I currently don't own one, I know from experience a good low angle block plane makes short work with endgrain. And when the need arises, even a decently sharpened #4 Bailey will do. At least I still have that one...
But hey, a cordles powerplaner may well be your go-to tool. Whatever rings your bell.
Anyhow: you've made clear why such a tool would be useful in your situation, which is what I asked in the first place.
Thank you for that.