this prob belongs in altcoin discussion not mining
anyways, of course you can do that AFAIK, it would be the same as an independent chain PoS
you would just code into the smart contract conditions in which the coins are paid out
pos style: a user hodls 35000 tokens, code that if they continue to hold them, they receive say 2% over 3 months or w.e you want
the contract then pays itsef out
PoS could be coded in easily into an ec20 token imo if you know solidarity, just make sure to test it! dont want another DAO haha