Good god, no.
Ultron isn't a ****-up....it's the ultimate killer robot, and still self-evolving. A Hammer-built Ultron would be as useless as tits on a bull, and would have so many design flaws that even Forbush Man could kick its ass.
Yep. Are we really losing our perspective on Ulton so much that we would just let anyone be his creator? First Stark and now Hammer. Ultron is an awesome villain and part of the reason he is so awesome is because of his relationship to Pym. You can't just plug any scientist/inventor into that role and expect it to work.