A slightly different take to sandblasting.
How about stripping down with something like this:
https://www.stripperspaintremovers.c...ct/solvistrip/
Then something like one of these to prep & convert any rust:
https://aquasteel.co.uk/
https://www.bilthamber.com/paints-an...ngs/hydrate-80
Then coat with the finish of your choice.
Good luck.
Andy.