Hi,
I looked up my stages for the last five days before SJPP and they were: -Uzan -Cambarrat -Navarrenx - Aroue -Ostabat -SJPP.
I think it is a great idea to start for a few days on this route, but the tricky bit might actually be to get to your chosen starting point, as a lot of this landscape is very rural, and public transport is thin on the ground. Uzan for instance is a very rural little village.
I walked through here in May when it was pretty much necessary to book, but May is apparently one of the busiest months. (We happened to 'coincide' with a large group from Aire sur l'Adour to SJPP, which meant we had to stay a few places we might not otherwise have chosen.)
On the Miam Miam Dodo site you can see a Map.
http://www.chemindecompostelle.com/Selection/CarteFrance.html Click on the rectangles for Arzacq and Arthez-de-Béarn to get closer to where you want to go. This map only leads you to advertised accommodation though: there is more on the actual route. You can see a list of more accommodation here:
http://www.xacobeo.fr/ZE1.03.Puy_gites.htm Look to the end to see PYRENEES ATLANTIQUES (64)
There is an e-mail address given for the Arzacq Tourist Office:
http://www.chemindecompostelle.com/Selection/InformationArzacq.html Quite often someone will be able to reply in English at tourist offices, but not always. They might be able to advise on public transport for the area.
Margaret