Lucky for you, someone has recently been to the "edge" and has seen where the dome meets the earth. Cosmas of Indiocopleustes and other explorers also explain exactly what it looks like which is identical to the Encyclopedia. So, while I haven't been there, others have and described it for us.
I cannot locate that video on youtube, I scrolled through all of his vids and didn't see it. I did see 4 other videos by other youtubers and all referenced back to a woman reading that same passage, I assume those are re-uploads.
I would think that there are enough flat-earth/geocentrics who could donate to a go-fund-me page dedicated to raising money for an independent expedition to the end of the earth. Such an expedition could certainly put an end to the speculation and tossing about of conspiracy theories.