And I would add, I’d get a later train to SJPP and enjoy a few hours strolling in Bayonne. It’s a delightful basque town. There’s usually a train that leaves around 12.30 and takes a little over an hour.
I also find SJPP charming but it’s more a village than a town so you don’t need a lot of time to check in, go to the pilgrims office, walk around the town, eat, soak up the vibe etc. And if you’re there too early it’s likely you won’t be able to check in to your accommodation. Enjoy 😎