I've been wondering about that, too.
But personally, I don't even think the second half of this series would be worth a OHC purchase for me. It's been severely underwhelming thus far, with the exception of the Brian Wilson-ish issue. Right now I'm good with just owning that one Hawkeye OHC of the first 11 issues. Hopefully the series improves by the end and returns to form. But right now I can't imagine tracking down a $100 Omnibus for this, when I already own the good half of the run in OHC. But that's just me.