This is an interesting topic...but not as as straightforward as you suggest. Different producers/broadcasters have differing criteria as to what constitutes HD for delivery. Some (eg Discovery) have different tiers.

Also, other parameters such as 4:2:2 vs 4:2:0 and who will be doing post-production (yourself or the broadcaster's team) will influence acquisition/delivery requirements. Some won't accept anything that's not on tape. Given that HDCAM SR can deliver 4:4:4 at 600mbps, there's a lot of variability in the spectrum of available codecs for broadcast.

The good news is that well shot material out of a hacked GH1 or GH2 is technically more than adequate for HD delivery...and some broadcasters are beginning to acknowledge this and to see the advantage to themselves in doing so. Recently the Panasonic AF100 was accepted by the BBC for HD requirements in the field. Given this fact, it's not so much pushing the hack settings to the limit to gain acceptance...it's how the camera is used and the final quality of acquired material (and an open mind on the part of the producer). If the hacked GH2 can replace the former "minimum" the BBC accepted for documentary work (Sony EX1/3 with Nanoflash) it will be a good start.