This is also something that I now want to do. The problem with your solution, which I had figured out, is that you have to constantly change the template. Not a big deal if you're listing Good Til Cancelled, but an extra hassle otherwise.

I am surprised that this latest update didn't include expansion of the eBay categories.

I am also still waiting patiently for eBay's item specifics and GTC listing features to be supported.

Now that there are 3 things that I have to manually edit on every listing, I probably will start looking at alternatives after the holiday season, because this is getting to be a lot of work.