Weird thing about dmso, you could buy it off the shelf back in the 80's and then it was banned for a while. I think it was the dead Kennedy's that wrote a song about it, the lyrics go if you put a drop of lemon juice in DMSO and touched it with your finger you could taste the lemon juice.
Not sure if you ever tried Voltaren Gel (diclofenac sodium 1 %) but that and 800mg Motrin works really well. It's prescription but doctors seem to have no problem rxing it. Both are non-narcotic.
I would also wholeheartedly like to see SL incorporate her Pure Evil into a medicinal product. This is a great thread! Thank you for sharing. Cheers!