There are several floor trusses which are easy to bypass, but about 6 feet from the edge of the wall is a plywood firestop (red) that already has holes for Pex plumbing, black iron gas piping, and ventilation duct. From room A, I can get within about 4 feet of the firestop but I can't reach it to drill a hole.
I spoke with a contractor who said the easy method would be to cut a big piece out of the ceiling of room C, right next to the firestop (green) and then replace it when done - but I don't want to do this if I can avoid it since I won't be able to match the ceiling texture and paint afterward.
Will a flex drill bit extension (50" or so) allow me to drill the 1" hole I need? Is there another easy solution I'm missing that doesn't involve cutting a hole in the ceiling?