#1:
G55 pointed the way towards the Man in the Moon ('lunatic', right?), and checking the poems:
He coveted SONG, and laughter long,
and viands hot, and wine,
#2 is making me think of Isildur: he has the 'Norse thinking' in "This I will have as weregild for my father, and my brother", and 'water meadow' in Middle-earth points strongly at the Gladden Fields. But that doesn't give me an answer, so I'll just leave it as possible inspiration.
#4: still scouring the maps for the land of Meanbeheadings...!
hS