Has anyone tried a high bid for an ad group, yet minimum 5 cent bids for all the kws in the same ad group? This way I am thinking that you can avoid G search clicks while encouraging content network clicks.
Technically, I don't think it'll work because AdSense actually works on the keyword level for quite a few things. It really only works on the ad group level to determine targeting (which is why your thought of bidding at the ad group level would matter).
I think you should try a bit of experimenting and let us know your results ;)
So by setting all keywords to 5 cents, I think you will harm your content rankings.
However, I've never done it myself. Might be worth a try.