Just found out about the new Hobie stand up H-Bar for the Pro Angler while reading the new issue of Angling International. Great idea. I'll certainly be ordering and adding one to mine when they become available in the late summer.
They also noted that there will be a fly fishing stripping basket available for it as well. Another great idea.
I couldn't find a photo of it on the internet, so far, but you can get the idea from a stand up bar I designed for Native's Versa Board a while back. The Hobie unit is aluminum and like this one can be folded down against the hull (gunwhale) when not in use. Obviously it isn't as tall as this one but hopefully you get the idea.
In the meantime, fly fishermen who are aggravated at their fly line snagging on all the "stuff" in the Pro Angler already have a built in stripping basket, although they may not realize it. All you have to do is stand up and turn around and face the stern of the boat. Drop the seat and use the cavity in the seat frame and the mesh seat back as a very functional stripping basket.