Reading about the poem, and the idea to "pray" at Squidhenge gave me an idea, along with looking at the sad Monoglyph. Maybe we should have a three (or four) player coop team go to Squidhenge and arrange them in the following way:
One team member kneels, facing the pillar directly across from the sad Mono, while two more do the same at the pillars on either side of the Mono. Either do that with the three person squad, or stick the fourth in the middle of the formation (thereby recreating the triangular glyphs seen so often in the city, with the sad Mono at the head of it all. Not much more likely than anything else that's been tried, but anything is worth a shot.