The money could come from re-building the CP Don Branch to Leaside as a four track, covered r-of-w for GO/LRT.
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Run above the DVP from the southbound Bayview-Bloor on-ramp to where the bridge re-crosses the river north of Gerrard.
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It can be built like a snow-shed, with grass and trees on top, merging Riverdale Park into the Valley = almost 2 km free of obnoxious DVP road noise.
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The Prince Edward viaduct already has internal walkways.  They could be expanded to run from Castle Frank to Broadview, and hung along the sides of the bridge below the road deck,  & glassed-in like the beautiful Reichstag renovation.  The LRT-Subway interchange could then be in the bridge, over the DVP.
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DRL won't get to Pape for a minimum 20 years (never, if the Conservatives are elected).  Don Branch could be serving Leaside, Thorncliffe, Flemingdon Park, Don Mills, etc., a lot sooner, for 10% of the money, using largely existing assets.  Flood proof, too.
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It could be incredibly beautiful.