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That’s going to be a really tough one to free up. Certainly worth a try. The pistons are oriented to your advantage so you can fill the cylinders with lubricant. There are many different types. PB Blaster, Kroil, or your own mixture of 50% automatic transmission fluid and 50% acetone. Let her soak for a couple weeks. VERY gentle raps on the piston tops with a 2 x 2 and hammer may yield movement. Or try gently rocking the flywheel. After a couple weeks of soaking and still no movement, I’d try the following because it has worked for me.
Grab a couple of old socks and soak them in trans fluid. stuff them in the cylinder on top of the piston. Light the socks and let it burn. It’ll burn for quite a while. Let it cool down then use the 2 x 2 and hammer again. Patience and care is primary. You can repeat the whole process but my guess is after seeing your photo that this process will take a good while.