One thought I've had
There is a rumour that the remain BG N car sets will be modified in the same fashion as those for the NE SG line into 8 5 Pure N car sets from the remaining 14 BG sets, and the former Z cars (now modified N cars BZN/BTN) made up into dedicated peak hour sets for Geelong etc.
Could they not remove the East end toilet and place a bike rack the same as BS218 for the remaining, then modify the last compartment into a conductors workstation, remove the seats, add a desk, chair and lock on the door.
This then gives you 5 more conductor/bike spaces, helps replace the lost 6 when the N cars are rearranged.
More Vlocities coming online so may not need as many sets. Plus there will be One extra N car than required for the 8 5 car sets, if they leave one ACN unmodified there is another conductor/bike space car.
Be interesting to see how many dedicated former Z sets are made up for Peak hour traffic.