Although you already declined, I must bring back wxlua.
There is a fine and well maintained github repo at https://github.com/pkulchenko/wxlua (for Win/Linux/OS-X).
I'm using it as it is bundled with ZeroBrane Studio. The wx binding from ZBS plays well together with bin/mingw32/luajit.exe, but with bin/mingw64/luajit.exe I get errors (wx.dll is no valid win32 application). So I'd need a 64bit dll.
Please give it a try to add it to luapower.