You’re right about private land in the Poconos. If it’s private, it’s probably posted, and most landowners I’ve talked with don’t allow fishing (or anything/anyone) on their land up there. Culturally, with respect to land access, the Poconos is far different than central PA.
My advice, don’t bother with private land. There are large tracts of State Game Land and State Forest in that area. Cross reference the PFBC Trout lists with SGL and SF maps…There’s plenty of good streams on public land that should keep you busy for a while.
FWIW also...My experience is that most small wild Trout streams in the Poconos have both Browns and Brookies. Don't overlook streams that the PFBC reports are predominantly Brown Trout streams, as some of these are very good, and most also have Brookies in them.