On total inversion, a method of recovery that I've been involved with, requires another vessel to tow the inverted boat in a circle, which brings the capsized boat upright, it worked every time . The boats were a GP14, towed with an inflatable powered by a SEAGULL O/B and an RNSA 14' dinghy, with a slightly larger rescue launch.
I have never tried this method with a 90 degree capsize, but the method requires a tow from the bow, and obviously the tow line needs to be secured through the bow fairlead, to the sampson post or deck cleats on the boat, all boats should have sufficient tow points.
So sailing in company , at least one outboard on the other boat, probably not an electric ,would be no good for lone sailors, thats why I use full ballast and a cut down main in the sea since I mostly sail alone and with the 'extras' Ive built into the boat and my overnight gear the boat is well down on it's marks but very stable (Matt is appalled at the weight) I could never race .
Steve Jones BR17 Nona Me