As long that it doesn't base on the awful "Age of Ultron" story, just the name only and use past stories where the character appears of course that make sense since in the early stories he appears to the Masters of Evil disguised as someone till he reveal who he was.
You can still say Pym may have been involve on Ultron if he had plans in the 50's and Iron Man tries to create it, the story could make sense where he creates a robot replacing him as Iron Man to help the Avengers but backfires.
You'll never get credit for my discovery,Who's going to believe a talking head? Get a job in a sideshow*Herbert West*
Deadpool: They replace Megas XLR for this!? Man where’s the world coming to