People seem to be confusing flight plans with PPR.
A flight plan does not replace PPR when required, and on the islands they certainly need proper PPR on the phone, they often have limits on their number of movements per hour due to controller training or break requirements, so just phone them.
If wanting to go IFR, perhaps stick a plan in, but it's all uncontrolled airspace anyway, so it's not doing a lot for you.
If VFR, just phone them to discuss PPR. Enjoy the flight
