Because the oil is running out of the cylinder with the piston all the way down doesn’t mean the oil can’t be of some help. Just need to add a little bit each day. Even in the cylinder that’s holding oil, it the oil’s ability to creep that helps free the pistons. It would help if you could position the motor so the top of the pistons are point up so the oil flows around the top of the piston, and doesn’t have to climb up hill. I second Bob’s approach with moving the flywheel, and remember Labradors first suggestion. “Don’t panic”. Patience is required with this common problem. Give it few weeks. Can save a lot of time in the long run, and some money.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.