Pete, you may be retired and money tighter but for me its a no brainer. Like Tim, if it don't go in my bead blasting cabinet it goes to a sand blaster. (I sold my sand blasting outfit,glad it did). Most blasters around here furnish the sand and charge about 120 bucks and hour. For what you need an hour should do it a professonal blaster. There is guy here who charges $135 an hour and furnishes the sand and actually comes out to your house.
You'll be waaay head of things to let someone knock it out for you. Good luck and let us know how you come out.