That's really cool. I can imagine a couple scenarios that might throw it off (syncing my subs designed for the stereo mixes with Puggo's mono mixes), but under most circumstances I imagine that's not really an issue.
Might be worth a shot the next time I need to do a resync. Ultimately I'd use to just produce conversion data for my scripts rather than using Sushi directly, because my scripts convert graphical subs as well as text subs, Sushi seems text-only.