Sorry Steve, nope.
The slab is our method of not only protecting, preserving, and displaying the item, but also the security against fraudulent authentication issues. Outside of the sealed holder, we would have to mark the item with something (sticker, invisible ink, etc.), and I'm just not fond of any of those options. See Leon's post a few days ago on Authentication and stickers on items
I agree it would be a cool option to the service, but I haven't thought of any way to realistically do it at this point.
Thanks!
Mark