I have two small blasters. Just a small hopper, short hose and the gun attaches to the compressor hose. I've used several types of blast material. A cheap one is just simple play sand, sold near you. Crushed pecan shells, etc. My favorite was called Black Witch.
Oh, a face shield.
This approach to blasting will help in the corners and tight spaces.
Years ago I found a product in the auto stores for rust called Extend. Once to clean metal, spray this stuff on. I think Loctite Co bought the brand is now on their site.
You have a compressor and you may be able to rent a blaster for the day. One of mine is Craftsman brand. IIRC, $59.00 back then.
Save the $900.00 (G).
-- Oren
"If things get any worse, I'll have to ask you to stop helping me."