And at block 4,289 plus 11,200 (IE, 15,489) I connected the road to the Mushroom island.
I had collected a little bit too much dirt on the islands nearby, but at least I was finally there. After digging a shelter with chests and bed, the next question was obvious : I don’t have any wheat.
The wheat will be necessary to convince the Mooshrooms to follow me. Without that I’m not getting much farther in this adventure. 4,208 is the border, so I could make myself a weird looking wheatfield just outside the island. And having too much dirt and a stack of seeds, I did just that.
Then in true distracted Steve fashion, I realized the testificate villages I had passed by on the next landmass had plenty of wheat. A trip to their jungle and back, and I was at last on my way with four Mooshrooms following me (VERRRRYYY SLOOOOWWWLLYY) along the land bridge back towards the origin.