They're inherently super-convoluted characters. Especially when we consider how the MCU is handling them. The logical thing, in my opinion, would have been to bring them into the MCU in Multiverse of Madness but no. Instead, the road to bringing them into the MCU might look something like this:
WandaVision -> Agatha -> VisionQuest -> The Children's Crusade (?). They basically need to turn White Vision into the real Vision again, they need to bring back Wanda and only then bring in the kids.