Meso Farming Spots Post BB

You need to do a jack barricade quest where he gives u a map as a reward which u give to the head of the ninja clan and you can do the exchange quest except to do that jack barricade quest u need a bunch of pre-requisite quests done including subani's legacy and versal's quests

Fortunately the Subani (John Barricade) and Versal (Elpam Gorlab) quests are now very easy.
How easy? I got all the hyperglyphs needed before I finished killing the 200 electrophants needed for Cleaning Up the Streets, that's how easy.
Make sure to do Subani and Versal in parallel, as the Fire Tusks you have to kill for Subani's first quest drop the Magents for Versal's first,
and Electrophants drop both Hyperglyphs (Subani) and Temporal Fragments (Versal).
All of those are quest items you won't see unless you have the quest active, so, as I said, be sure to accept the quests at the same time.