Let comment on what I know from personal experience.
N6.0NA
I found it takes about 300-320 lbs at 4 ft (1200-1280 ft lbs) to right them reliably with everything else right
This implies the rig is about 75 lbs with a center of mass about 16 ft from the pivot point
This implies that 150 lbs hanging from the end of an 8 ft righting bar should be able to right the boat
Righting bars:
I built one before they were available commercially for a 5.5uni
I found to right a 5.5 uni, I needed my weight (180) hanging from a rope about 7-8 ft out.
Curled around the bar like a monkey didn't work.
Attaching your trap harness to a loop at the end will find you 8 ft under water when the boat comes up.
I finally put a knotted rope on the end of the bar and climbed the rope until the boat came up
Righting bags
I found if you are strong enough to manage one of those things, you are big enough not to needed it
They leak
They make great wash down buckets
They make great sea anchors, when they fall off during a race
They make ok sea anchors when the boat finally comes up, you lose your grip and the boat tries to sail off without you
They make good padding when you get blown against a dock because you couldn't right the boat
Trying to right your boat with one in 3 ft seas gives you something to do while waiting on the rescue boat
I last saw my righting bag floating toward LaPorte TX, if someone finds it, please keep it