My brother in law and I team up to trim our fence lines. I stand in the bed of my RTV 900 with 16" bar chain saw and saw off anything I can reach while he maneuvers the RTV around so I don't have to get up and down. Teamwork like that reduces the time and effort by a factor of at least 10.
A couple of planks laid across the top of the bed gives additional foot of reach. I can get almost all of what needs to be cut to clear the cabs on our tractors from the RTV with a chainsaw. Some higher branches that grow downward require a pole saw to reach up enough to get them out of the way so we usually carry that tool also. We also trim up all the trees around the property that are scattered so we can drive under them. It takes a re-trim every couple of years to get rid of the stragglers.
After cutting limbs and just letting them fall, we either load them on the RTV to haul to a burn pile or if lots of them in a small area, just use the FEL to push them into a pile for burning. We don't have a grapple but that would have been nice to have earlier on when lots of trimming was going on, but now it isn't worth the cost for no more than we have to maintain.
I may look into the electric pole saw idea since we have 3 generators from 1000W to 10,000W capacity. Might be better than cranking on that pole saw which is a bit awkward with that long pole sticking out and you don't want it to touch the ground OR anyone around you.
This sounds like a good way to do it. I guess I will need to back along the tree lines so that I can cut the branches before the cab hits them. Pole saws are great as long as they crank, and you keep that tiny bar oil holder full. Does your 900 meet and exceed all your expectations?