We offer design integration services, as does Czarina and Zuzana Designs and I know there are others capable of doing this.
Another option is to find XSL/XHTML guys on freelance sites like guru and rentacoder.
The design code itself is actually well commented XHTML and NOT XSL although the templates use XSL for program output.
Now for the good news...We're a couple weeks away from wrapping up an inline template editor that will be much more friendly and easier to use and will let you edit the sections within a browser rather than editing the templates by hand
