How about chemical stripping?
Try:
"Krud-Kutter", available at Home Depot;
"Goof-Off", available at Home Depot;
"Jasco", available at Home Depot;
There are other paint removers out there. As always, read the WARNINGS, and heed them. Try what ever you select on a small section.
I used a combination of those on a aluminum Shelby air cleaner top. I also lowered the air pressure on my bead blaster to 75-80 pounds and used glass beads, 40-80 grit - "gently". I have another happy Shelby owner.
Jim