Couldn't you just run the Oro arc, log out and restart the same IPP mission? That would work with 1 toon, but you'd have to do it with every toon and not have it readily available as Voltor said.
P.S.: I just ran it twice doing the logout without completing that mission. I started with 36 already defeated. I got the badge after the 2 runs. So 3 runs all together, and averaged 33.3333333333 per run lol. I had 36 on first run, 70 after the second and dinged on the 3rd run with a few IPPs left over.