on the 600d, I've removed the lower shutter completely (leaving the solenoid connected) and it has yet to throw an error, its rivet failed around 1.4 million photos, I'm suspecting your also thinking of removing the solenoids aswell, if so that would make things harder as it will be some delay circuit between the solenoid pulse and I believe a home switch on the top shutter,
The flaps, and the solenoids as best I could tell where completely independant
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