Besides being very slippery there is not much room up there to walk around, multiple vents and covers and panels and shrouds are all up there. Not sure why one would want to have access to the cluttered area, any maintenance can be done from the sides. Perhaps an interior wooden support can be fabricated, I have heard of some over on FGRV to support roofs for snow loads.
In addition even stepping near a vent can cause any seal to break whether aluminum or fiberglass thereby causing more issues.
Due to the pandemic, my life now exists of only 3 days, yesterday, today, and tomorrow. Everything else has been forgotten!