that's pretty much what I did on the above, although I finished with a very light application of t-cut, which I think was a mistake (although I got away with it luckily.) That paint renovator stuff used on the SBDU looks much better/gentler. I'd go with that Anidel
Paint renovation... this guy is a wiz at getting old SBDU frames to look like new again. His technique, products and video are here:
https://raleigh-sb4059.com/2020/07/26/sbdu-paint-preservation-sb9-1974-cleaning-the-original-paint/