maybe refund the btc for the unclaimed lisk. then put that lisk on the poloniex sell order at about $1 each. add btc received from that to the dev fund.
As I understand, the unclaimed LISK will be available after launch by creating a support ticket.
And no launch before a substantial percentage of the LISK have been claimed.
I don't think it will delay the launch and enough people will have claimed their LISK.