I'm thinking of approaching Manly from the Wingate Road S of Balarat, essentially the SW ridge, just N of the true Coyote Canyon. There would be 6000' of elevation gain, but I wouldn't need to punish a vehicle with the bad roads.
The google-earth image looks reasonable -- no cliff bands, fairly consistent ridge, no excess scrub.
Do you know anyone who has tried this?
As I sit here with a sprained ankle, I'm thinking about the next solo scheme.