Is there any significance to the Astrariums?

We were told that in the past several cults of Andraste, but particularly the Order of Fiery Promise, had an interest in these. The OFP's interest was because they believed that they were connected in some way with the existence of the Veil and so wanted them destroyed because that would result in the destruction of the world as well. Now I don't believe the actual astrariums we found had anything to do with the Veil but I wonder if the idea is relevant. Suppose for example, the Order of Fiery Promise had come across murals depicting the raising of the Veil that used objects that looked like the astrariums? Then their belief would have some substance, particularly when you consider that Solas claims that removing the Veil will result in the destruction of the world through fire, just as the OFP believe. It seems very heavy handed of the writers to introduce something so similar and then it be just a red herring.

We were also directed to a number of objects by Solas that looked like miniature astrariums. What did he claim they did when switched on; strengthen the Veil. I'm not sure now but were they not also found in the same areas that we had astrariums: Hinterlands, Storm Coast, Western approach, Crestwood and Emerald Graves (I'm not sure about this last one). There was a set of astrariums in the Frostback Basin but without an accompanying ancient artefact and an artefact in the Hissing Wastes without the accompanying astrariums, so there may not be any connection between the two.

Then there is the fact that before he woke up, Solas had his agent Felassan operating in the world with the specific instruction to obtain control of the eluvians. Why did he need these if dropping the Veil was a simple matter of activating his orb and entering the Fade? It strikes me that in order to undertake his plan, he needed to be able to travel to several different locations quickly, for which he needed the eluvians. With the astrariums, there is always a group of three, which when all are activated unlocks another location. So could this be how he originally raised the Veil and how he intends to remove it?

At the moment I'm thinking that Skyhold is the location of one of these points of activation; which is why it has the name it does and the others have yet to be revealed but are to be found somewhere in the north of Thedas, one possible location being the pyramids of Par Vollen, which appear aligned to the constellation Solium.