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Any oil based chalky surface sealer should lock the calcimine down, providing a stable surface that will accept any latex ceiling paint.
After the salt dough hand prints dry, you will need to spray the acrylic sealer on after you paint them, not before.
Sure you can. Use Porch and Floor enamel for a good finish. Available in Home Depot.
You probably can. As long as the masonry paint is 100% acrylic, you will have no problem at all using it on a wooden porch ceiling. Using a cheaper vinyl paint is not suggested on wood though as it will craze and crack over time.
Chalkboard paint is specifically designed to be porous in order for the chalk to adhere to it. Using a sealer of any kind over it will result in loosing the porosity or tooth, rendering the chalkboard useless.