I have fished Pymie for fifty some years and I am an Ohio resident. Only launched once in my life from the OHio side. I love the northend and Linesville launch.
You can launch anywhere your heart desires.
You can use either license, as long as you are fishing from a boat.
You can take your catch from your boat to your vehicle, doesn't matter where you are parked You caught them in the lake, legally, not in the parking lot.
You MAY NOT fish from any island unless you have a Pa license.
Kayak, just an FYI, Linesville updated their entire marina when it was closed last year. They even installed two very nice launches from the dock area by the boat house just for kayaks. You should check it out. The other bonus is the Islands provide nice cover if you are there on a windy day. I had some pics of the new marina when it was being constructed but I think I deleted them...sorry