Isn't something in this direction possible
Although that's possible.. that's not strictly necessary if we patch AC code and hard fork..
Essentially only 30m + 160m or so have been distributed to people (even though 30m was given to the dev scammer as BTC, the people who received it shouldn't be punished).
So the total coins in circulation outside of the premine is only 190m.. When 320m was the target anyways for circulation after 1 year.
So it's very easy to adjust the POS reward so that the exact same # of coins appear in a year's time .. 320M from this point.. as long as the premine is eliminated from the equation..
In fact with a hardfork you can make any range of target for coins between 190m to some number.. if we want to keep it artificially rare.. it can just stay at 190M with 1% stake interest...