I know this thread is a little old, but since it's still on the first page...
If you're not concerned about being able to STP, you can actually pack with the play harness for the Peecock -- I even double-checked on this -- it's designed to be comfortable enough to wear 24/7, basically. The difference is that it holds the Peecock tighter to the body than the packing harness does, which doesn't allow for STPing while wearing it (but is why you can use it for play).
Figured I would mention it if you haven't made a decision, or for anyone else looking at this thread.