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Does the alternator have a big nut on the end?
it does, That may work, I can try to tighten the belt and see if I can get the pistons to move slightly.
There is no way the alternator pulley will turn the engine in its condition. I was looking for a way to turn the crank with something with more torque like a breaker bar. The sterndrive and plugs have been removed
If it will not turn with the starter the engine is going to be stuck. Without pulling the engine the only way you might have success in turning it over is by using an stermdrive input shaft. I don't know if you work in a shop, are friendly with a dealer or not. But if you are, see if they have a junk input shaft for an alpha kicking around. If not, what you would do is press the ujoints out of yours so you can take it off. From there you would remove the hing pins on the gimbal ring, and remove the bell housing from the transom. After that you would have enough room to slide the input shaft in back through the gimbal bearing. And then stick a cheater bar/iron pipe through the eyes on the input shaft. And try to rock the crankshaft back and forth that way.. Does that make sense?
Also, if it is stuck.... Add some acetone to the cylinders..... It will thin out the mystery oil and help it creep past the rings.