Hi there.
I told you that I got some thoughts on PoB. However, the more I think about hybridization of PoB and PoS, the less I see any real advantage of implementing it as in both cases the one who has 51% of coins also has a control of network, so It can't be used to protect the network from such kind of attack. Also, the PoB in a sense is a PoS (you have some stake you willingly dedicate to participate in PoB) but with different rules.
So, I propose, to start with pure PoS to let the things go. If anyone in the future would propose the clear scenario how PoB could prevent the 51% attacks then we could implement it.