A great alternative to glass/sand/soda blasting, electrolysis and molasses is ultrasonic cleaning. It's not abrasive, cleans inside and out (as it's immersed in a tank), removes rust and paint with the right solution and is quick and cheap. Admittedly I have a large commercial machine in my workshop but it would clean up everything you have there in around 30 mins and wouldn't cost a great deal. Might be worth considering if someone does it close by
