There are people on the Bitcoin forum that can do trades of Bitcoin-fiat. I suggest that you open a thread in the marketplace section and title it selling Bitcoin for PP/ Fiat. However most people aren't willing to do trades with a non-trusted member. They will probably also require an escrow and will probably only do small amounts to avoid scams. Escrows might charge small fees, but i think it's better than having Bitcoin but being unable to liquidise. Good luck