Sorry, I'm coming in on this late. Wouldn't it make more sense to add the gui part of this to the specific control surface plug in, as opposed to having two plugins? Your control surface plug in is already going to know it's state and so the gui representation just has to reflect that state.
I've been messing around with wxWidgets some and it's pretty cool, actually. Took me a bit to figure out how to build and link a demo application to it, but once you're up and running the code is pretty simple to crank out. There is also a resource editor, apparently, but I haven't checked it out yet. I'd definitely consider using that over MFC.
I've been working on a standalone app, though, so I haven't actually built a Reaper plugin that uses it. I don't see why it wouldn't work, though.
chris
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