I think basing something on HyperStake might work too.

https://bitcointalk.org/index.php?topic=678849.0

It's a reboot of 'truckcoin' blockchain which was PoW, but HyperStake is pure PoS, and it has some very innovative economic features. Very high stake 750%, but it also includes very clever inflation control through having a maximum block reward of 1000HYP.

The innovation with HyperStake is in the 'numbers' and the economics, so we could alter them slightly and see what happens. Maybe change the stake interest to 1000%, with a max block reward of 1500, something like that.

Code would probably be a copy-edit-paste job, so less demanding, but still an interesting experiment.