You've been asking about this for years -- long before it was a glimmer of a project. But now it's out in the world. Daughter of Mystery has an audiobook from Tantor Media, narrated by Kitty Kelly. Here's the Books2Read link page with all the audio outlets I've tracked down and added so far.
I started listening to the first couple of chapters while making breakfast this morning and am loving it! (I'll probably add it into my sleep-listening rotation.)
Spread the word! There are more and more people listening to audiobooks for the multi-tasking ability, and maybe we can tap into a whole new readership.