My only thought was "Why not reinstate Route 77?". For those who don't know, Route 77 was a tram that ran from Flinders Street Station along the same route as 70 (in the days before the new route 70 past the Tennis Centre) until it got to Church/Chapel street where it turned right and joined the 78/79 Prahran/Richmond North tram. I pointed out to my flatmate one day when were on the 78 that the curves are in fact still there so it wouldn't take much to reinstate it; cheaper than a ferry I'm sure and a direct tram from the City to Chapel Street; maybe even use some of the spare W's in storage specifically for the purpose.
Thoughts/reflections?