Thanks for all the feedback. Not really something I'm likely to try, just something that got me curious when looking at some recipes yesterday. The one I liked the sound of only uses like 3 Tablespoons of butter and then if memory serves like 3/4 cup of sour cream. Got me wondering how sour cream would work. I know it gets weird when you freeze it and then use it to cook with (made some sweedish meatballs, and it was like the sour cream turned grainy after thawing and going into the mix). Most recipes I've used with sour cream it's usually an add in when there's very little cook time left just to cream up the sauce, so thinking folks are right that it doesn't cook well for longer times. I did also find one idea 'round the Net to basically try and infuse some regular or heavy cream, then once that is infused (assuming it can be) break out the buttermilk and vinegar and dig up instructions for making sour cream out of the cream. Don't think I'll actually ever try it myself, was just a thought.
I did find one interesting thought while researching it, though....if you COULD infuse the sour cream, how nice would a big dollop of that be on some tacos?