Ah, that's an idea. Start the service at the Zoo, instead of the end of the LRT.^
the 86 scarborough should still be running on meadowvale, it's not all being replaced by the LRT, plus there will still be a bus route on sheppard east of where the LRT ends, they could easily run that route up to the zoo as well,
I'd think the 86 Scarborough frequency would be much reduced. It's about a bus every 7 minutes from the Zoo now ... but much of the demand is on Kingston Road, not on Meadowvale. I'd think it would be a 20-minute service ... which wouldn't handle the peaks between Sheppard and the Zoo.
But a combination of whatever is running down Morningside, and whatever runs east on Shepherd to Rouge Hill GO might do the trick.