After some experimentation, I found 'Vintage S.G. ' in a set of Alinico IV Stormy Mondays.
More balanced in the e.q , and tighter in the bass than Alnico II Stormys, but minus the hardness and bite of Riff Raffs. Alnico II Stormys were very nice, but a bit soft and 'blurred' in the bass for my liking ( and I use 30, 42, 52 on the bottom end ).
Tim recomended the Alnico II to IV magnet swap instead of a pickup swap. I lost ( as Tim predicted ) a little sweetness on the top end, but still have enough to play mellow.
Thanks to 'Twinfan' who persuaded me to persevere with the AIV Stormy / S.G transplant , instead of leaving the S.G. stock, and saving the Stormys in the cupboard for a future project.
I also found Mississippi Queens where a close second, but I had a 335 copy that was begging for the M.Qs
:)