a delagated proof of work
Delegating to others means trusting them. Why would one miner or pool trust another miner or pool?! They're fiercely competing each other! Any miner would love to get an edge, even by not playing fair, in order to win the next block. Bitcoin is not meant to need trust in somebody else. That's why it still works.
Maybe I'm missing something, but this looks to me more about not taking into account the human factor (and the high chance some would try to cheat), than about cryptography.
In this case there would be no trust involved, the delegation would be a result of a cryptographic process/proof of work challenge. Ignore any reliance on "trust".
I'm wondering if such mechanism is possible and how.