Actually I don't understand the problem at all:

If one uses a camera on tripod there is usually time enough to operate a camera fully manual (metering, time and aperture setting).
As the OM-1 has the feature of closing down the diaphragm independant of releasing the shutter, via the DOF-control knob at the lens, employing this should avoid any vibration issue caused by the diaphragm proper.
There still might be other sources of vibration though.