Dolphin looks interesting, but unless they specifically share the controllers feedback in some way (OSC would be nice) I can't think of anyway to work with it out of the box.
I did a little digging and it appears that Dolphin can be extended... This project appears to add a python enviroment into Dolphin: Felk/ext-python: Dolphin Emulator's external dependency on python, for embedded scripting. Included as a submodule (github.com)
There may be other options. The idea would be to get the values in the script and instantly send them out to Isadora (probably OSC would be the easiest method).