SMN exists in the problem of the fact that the current summons are boring as hell but there’s functionally nothing they could add to the rotation within the current framework that would make a significant difference to it

The other three gemstones would just be 3 slightly different varieties of the current gemstones which don’t remotely add enough to the rotation. The Demi’s are a mess because they are forced to be summoned on a 1 minute CD to not desync but the class doesn’t have functional filler

The only way I can see an iteration of modern SMN to work is to functionally reverse the way the gemstones work. You “channel” an element or you can channel multiple elements at a time. Then once you have sufficiently channeled that element you can expend that channeled energy to summon a primal which will do an AOE attack then stick around for a few GCD’s and unlock some augmented actions

you only summon one Demi per 2 minutes and it’s based on which set of 3 primals you summoned. If you summon the three umbral primals you get Phoenix, if you summon the 3 astral primals you get solar bahamut, if you summon any other combo you get regular Bahamut. They have the same damage but different secondary effects

So the closest analogue would be imagining the six gems kinda like PCT’s muses but the more I think about it that way I don’t know if it’s too similar to PCT or not