May not be a good answer but if you don't find a willing person in your area you can setup your own small sandblaster relatively on the cheap. They make a small hand held unit that works pretty good for small jobs, a bunch of them are available on Amazon and at Harbor Freight for $25-50. I have one that I have used for years. The expensive part is an air compressor to run it. To get a compressor to run even a small sandblaster gun continuous can be expensive but smaller units with a storage tank can run for short times than wait for pressure to build. You can make an auxiliary tank out of an old propane tank to run in series with the tank on the compressor to get longer run times. The bigger tank lets you blast longer but you wait longer to start again, so get as big a compressor as your budget allows. Used compressors are another option.
