Yes, tricks with scouting work here; I myself went through it that way.
It seems to me that the author had too much of a desire to make all these quests more complex, and as a result, he overdid it. Therefore, it is not surprising that players, seeing all this madness, begin to look for some ways around it. As soon as I got into the editor, I immediately saw that the opposite bank is very close, it's just not visible. Figuring out how to get there was just a matter of technique.
I looked at the slightly updated version of the map.
I also, since I was already in the editor, decided to take a look at the updated version. At first glance, it should be easier to complete. There is a Book of Earth, and in cities where there were no guilds, they are now available. Although, perhaps, in some ways it has become more difficult. I didn't examine it closely.