[Haskell] wxHaskell with active GHCI input loop?

Hello Haskell Hackers, I am trying to create a wxHaskell program which, while the GUI is active, enables the user to type arbitrary haskell program fragments to interact with the GUI. Initially I thought I would run the wxHaskell main loop in a different thread, and interact via the GHCI main loop, but I see that multiple threads are not supported by wxHaskell. I am wondering if hs-plugins is the way to go, arranging for string input to be taken in the GUI, and passed to the hs-plugins eval function. However I want the interactive Haskell to be able to manipulate objects displayed on the GUI, and am not sure if this can be done with such a subservient hs-plugins evaluator? Any suggestions? cheers, Simon