could we pay out research at each superblock?

Not possible with the current SuperBlock/NeuralNetwork implementation, it would require significant development (we've got higher priority items in the roadmap) and would potentially negate one of the primary reasons for holding GRC (increasing payout frequency) without a replacement economic incentive.

It would also potentially increase the computational complexity of verifying superblocks as each payout would require verification (100's/1000's/10k+ POR payouts in a single block?) compared to only a single CPID requiring verififcation in each block right now.