Hi
@Kiwi-family The Aragones backwards from Puenta la Reina is very doable. Honestly I think you could almost 'follow your nose' with the occasional reference maybe to Gronze maps. We love the Aragones. We were in the area again just recently and walked a few days back from Jaca up and over the Col du Somport. Bonus is getting to stay in some very special albergues - e.g. Arres, Canfranc peublo.
As to what happens when you go over the Col and arrive in France, I have no experience of the GR 10 but from Urdos shown on your map you can continue on the Arles Way to Oloron St Marie (2 days) (where the Arles and Piemont routes connect) and take the Piemont to SJPP (you will once again be going in the 'usual' direction).
Our stages from Oloron to SJPP were quite short.
- Oloron St Marie - to Hopital Saint Blaise (24 kms)
- Hopital Saint Blaise to Mauleon Licharre (17 kms)
- Mauleon-Liccharre to (Chez Sandra just before) Saint Just Ibarre (22 kms)
- Then to SJPP (24 kms)
The route from Oloron to SJPP is beautiful as is all of that Pays Basque area, as you would know well.
Re navigation. We used navigation for the first time recently - and only occasionally - on the Baztan. I used Wikiloks and it was very easy. As others have said on the forum - once you've downloaded the track/s, it works offline, you can put it in your pocket and if you go off track it will 'beep' you. Most of the time we didn't need it, but there were a couple of occasions when we appreciated the beep!
PS Just remembered - for much if not all of the Aragones, as it continues from the Arles Way, you have the two way red and white GR signs, so I think you would find it quite easy to follow. Even though it's Spain by then, the GR signs continue for some if not all of the Aragones.