Hi there, late but present!
I had to manage a couple of times in the past the same route. there is a regular daily ferry link, between Piraeus and the Kiòs island, in face to turkish coast. from here, you'll take a small boat (wich also carryng a lot of cars and bikes), then it will cost you more if compared to the link distance, 30mins aprox. not less then 40€ each, and a little bit more for the bike..., sounds like a robbery. the ferry should to arrive in Kiòs very early in the morning, 2 a.m. and you'll walk asleep like zombies in the dark, waiting for the custom in, 8 a.m. be quickly at the custom, it is not a large boat.
ANYWAY, ENJOY YOUR JOURNEY!