I am of the mind that it would be better to have the STO Rapibus go directly to Bayview. I am not talking about EVERY Rapibus, just a new route, say, 500.
Since the 400 bus runs only 10 minute service, I would imagine that the new 500 could also run 10 minute service. That would give a bus plenty of time to run the distance from a Terrasses de la Chaudière stop to Bayview, across a one-lane bridge. If passing is necessary, buses can do it a lot more simply than trains can.
To minimize winter maintenance required across the bridge, I would suggest lifting the existing ties and rails and installing a metal deck, similar to what is used for vehicles on the Alexandra Bridge. Since it is pourous, it will not require plowing or salting. A cantilevered extension off one side for a MUP would be a ‘nice to have’, but that should not be part of the transit budget.
As for getting to the bridge, I would suggest that the new 500 could follow the 400 route along Montcalm, but cross Laurier and follow the old rail spur route to the Prince of Wales Bridge.
The idea of using the Prince of Wales Bridge is not to ‘funnel all Gatineau traffic through Bayview’, it is to offer another choice.