>>114089534Pym works really well as Marvel's Doctor Who stand-in, since he has so many personalities, and has off-beat low-budget adventures.
However, unlike Doctor Who, he's pretty much either hated, or grudgingly respected by the people in his continuity.
If you bring back Pym, you have to make him go on off-beat adventures that effect the fringes of the Marvel Universe.
This can work as either cheesy sci-fi, or horror sci-fi.
You can have Pymtron as his evil-twin, as the original Pym still fighting a mental battle in space, and Ultron made a copy of himself. So Pym returns with robot powers to go with size-powers.
OR...
At the end of Hickman's Avengers/New Avengers run, 616 Earth disappeared in a white light, with Pym being one of the major Avengers left behind.
You could have 616 Pym appear having saved the multi-verse (using Pym Particles, and his connection with Eternity to save things.) and appear with 616 Earth on the opposite side of the Prime Earth's rotation cycle in out solar system.
A more mature, event-weathered, and mentally repairing Pym could see what New Marvel has become, and try and fix it so it's closer to 616 Marvel.