my idea was a (own) exchange with promise they add the mined coins after 14 day (example).
every user get a wallet of each coin in his profile and the transaction to this exchange is free. or the exchange is on this site too.
sry about my english.
Just have the pool hold the coins until it is listed on an exchange and then you can give the address for a Crypsty wallet (for example) to cash out to so that you don't have to deal with downloading thousands of shitcoin wallets.