I'm with you on buying the chemicals! There is also an interesting post on the special projects forum on this site, if you have not see it. It's a long one, so have a beer to slurp on. It's damn fine reading on this topic.
I think if we all keep on posting our findings, we'll zero this process in. I figured you made a typo on the potassium chloride, but thought I'd mention it, in case you didn't. Keep us posted on your progress. I find this topic of real interest, even if there are probably only about a dozen of us reloading 22 LR in the country!