I'm not familiar with large attics not having floors, in the limited number of hours I've lived in. I guess that's modern.
The flexing is possibly going to cause a much harder to fix problem with sheet rock than extra 3/8" holes from a wider beam. I'm kinda prudent.
What is the span in the room?
I'd just use 2 2x4s, about 40-50" long as "snow shoes" for access. Through- bolt through a 4"x4"x8-10' spanning 4 rafters.
Part of aerial work is twisting up, then dynamically unfolding, with a semi-sudden stop.
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