I'm not sure about what C-41 would do to C-22 but like I said, what have you got to lose? As for having a lab do E-6 in C-41, it's a common practice. Here is just one web page from a google search on the topic.The C-41 process will destroy C-22 film, and the same probably goes for E-6, if you could even find a lab to do it for you.
http://www.planetneil.com/colourzone/cross-processing.html