The unlocking period was once heavily debated topic, but it sort of died out from the focus after the conflict with Sun and the Hive fork, when it somewhat showed to be usefull. At this point I think the most elegant solution will probably be via smart contracts and intorduction of liquid staking, similar to whats Lido has done foe ETH via stETH, and then be able to trade the liquid staked token on and L2, where probably becouse of the long unlock it will be slightly cheaper and depending on market conditions, do people want to unstake fast, example when the price spikes etc. The implementation will probably be a chalenge, I see VSC and their system as probably one of the layers where this can be implemented.