I thought that parking at some of the monorail hotels is limited and that they will (or have the option to) give you a 3 hour permit even if you are staying at another wdw resort. If asked why you are there, I don't know if a meal at Trails end would be a good reason to be let in.
I think that parking at the FW lot and taking the bus is very easy. My ds likes the internal FW bus because he likes all busses.

I like looking at the campsites & stuff. Parking in the FW lot is no problem.
Parking at the MK lot and taking the boat also seems like a good idea if you are going to end up at the MK. Of course, you can also take the boat to MK after breakfast, then the boat back to FW and a bus to your car.
Or take a bus from your resort to the MK then the boat to FW. If it starts running early enough for your plans.