Hawker Siddeley (the original manufacturer for these cars) originally designed them to be very modular, the Series 1 cars when they were first built had provisions for EMU conversion inside of them, however I assume after multiple rebuilds those provisions no longer exist or would work with modern tech.
GO studied converting the Bi-Levels into EMU’s in a 1980 study and concluded that it would be too complicated and wouldn’t work with a lack of space in the cars for EMU equipment.
Here’s some cool concept art that Hawker Siddeley made for GO, VIA, and just a general design before anyone ordered them: