I can't make it but from somebody who rides those roads a dozen or so times a year.
I would suggest you meet somewhere closer to the spurs so you are less likely to loose people in the traffic before you get to the driving area.
Go up the Reefton Spur (from Warburton to Marysville) then back over the Black Spur (finish at Healesville). It's a much better direction for riding and driving.
If you have time divert up to Lake Mountain and back.
You will be on the spurs right in the middle of motorcycle peak hours so that means very loud, very fast idiots on two wheels overtaking you when they shouldn't and coming at you on the wrong side of the road plus a Police presence on unmarked bikes and with radars hidden in the bush. Both spurs are continuous white lines virtually from start to finish but that doesn't seem to stop some idiots front treating the road as a race track unfortunately.
If you want a route just say so and I'll give you a Google map of the best way from eastern Melbourne to Healesville.
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