CPython/Jython cross-implementation GUI

I need to make some GUIs for a Jython application, but would like to minimize translation time should the project switch over to CPython. HTML or XUL are possibilities, but ones that I'd li开发者_如何学Pythonke to avoid. Any ideas on a cross-implementation pythonic GUI toolkit?

From the discussion here, it doesn't look as though there is a single GUI toolkit that can be used across both Jython and CPython. There have been attempts like wx4j (wxWindows for Java) but these are not actively maintained.