I did something similar - started a "new game" from the beginning of Ch2 using the Sancho "maxcheat" start with the Ipatch active. Because it wasn't a ported game, and, I think, because the Ipatch was activated for the new play, but wasn't for the "historic" plays that would have influenced my "persistent" file, I have to play it fully through and haven't been able to skip anything, at least not so far in the Week 5 segment. I don't sit and play for hours at a time usually (maybe 2 hours max), so it will take me a day or so to see if this works to get the full three way, or whether I'll have to start an Ipatch path from Ch1. If so, then that will be a very long replay.