The challenge might be, from what I think I recall, is the highway ends where the lanes would re-merge, creating a massive bottleneck there. It’s easier if the re-merge is at a point where there’s less highway traffic and traffic can just continue to flow.
Like it would work northbound if the Malahat had more than one lane.
When going into town in the morning it seems to clear up after the Mckenzie overpass exit. So my thought was having an exit point there just when you get up that hump from the overpass where in theory is 3 lanes for a short period of time for the tillcum exit/mckenzie off ramp, Which then would also be the entrance when going northbound to bypass the merge at Mckenzie.
My thought for the remerge going north was when it turns to 3 lanes just past the overpass above where Burnside Rd W turns into the Island highway, As during rushout you lose a decent amount of traffic from the view royal/colwood exit, and the entrance point for going south could also be there or further up by millstream overpass.