Unfortunately, setting a 3 or more piece TR anchor may require a full lead rack, as you are often using a crack system with a similar width through-out the useable section. This would require several pieces of solid gear in the same size range. You might find places where that is a couple of solid nuts and a cam, but Murphy tends to require at least two good cams and maybe more of the same size.
There are a couple of spots along the top of Peterskill where two bolt anchors have been placed, such that you only need two slings or a cordelette to extend the master point/biner(s) past the lip of the top. I would recommend all biners in that case be locking ones. You seem aware that trees are off limits for anchors at Peterskill. Good luck and enjoy.