I'm looking for a ROM dump for QEMU experiments (mine is incomplete). You may get one from the Debug menu; please send it to me by PM.
If there is still interest, I can try to fix compilation on the latest codebase, then let you continue the port.
Side note: there is a small chance to get LiveView with the full-res silent pic backend, but the front-end functions are not present, so it will require some low-level research
along these lines. But my gut feeling says it's doable.
But since this camera has a simpler codebase, this effort might pay off for more recent models as well.
@wigyori: the implicit declaration on this platform uses 32-bit integers for all parameters. So, in this case, you may get away with: void unknown_gui_function(int, int).