Best of luck with your project. I can't help with a plasterer though. I enjoy seeing people saving an old neglected building. It makes me think I am closer to normal knowing there are others out there. This is my house that was built in 1897, became a 2 family in 1938, I returned it back into a single family shortly after I bought it in 1999 so I know about the years of neglect. My plaster replacement in the necessary rooms was just 5/8" blueboard with a veneer plaster. Most of the house still has the lime/sand plaster with failing keys.

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So have you abandoned the lime/sand plaster in favor of greenboard/blueboard ?