Is a P2Pool for P2Pools possible?

[amincd]

P2Pool provides a decentralized means of Bitcoin mining, but is limited in the hashrate it can achieve, as increasing the hashrate requires either increasing difficulty of the shares and therefore the variance in payouts, or letting the stale rate increase with more frequent blocks, which decreases efficiency.

Is it possible to have a higher level P2Pool that the lower level P2Pools send hashes to in exchange for shares, which can then be redeemed for the bitcoins earned by the higher level P2Pool? I know that the way P2Pool currently works, it would not be possible, but is there a theoretical way in which it could be done?

[wtogami]

https://bitcointalk.org/index.php?topic=329860.0
Subpool is one of the several approaches in the p2pool R&D brainstorming document.  Please donate to forrestv to increase incentive for him to work on these goals to allow true decentralized mining to grow much larger.  We donated $2,000 to start this fund raiser on November 8th.

[amincd]

Thanks for the link. So the idea has been suggested. Are there any specific proposals on how it could be made to work?