as Tony suggested, weight is gonna be an issue in your rucksack, although MTR is affordable.
The main issue I see is the extra effort of climbing for SOTA that adds to the daily effort of walking 25 km average etapes in the way of Santiago. This trip is not easy even without any SOTA!
This is a raw map of the traditional route (just showing main cities and stops):
If you zoom on it you’ll see that the way tries to avoid summits as much as possible crossing flat areas; you should deviate a bit to do some mountain top where they are near.
I live in Pamplona so I can assess on some opportunities in my area (just starting the trip the very first days in Spain if you cross from France - Saint Jean Pied de Port).
Summits near Roncesvalles.
- Txangoamendi EA2/NV-170 (a few kilometers further from Lepoeder pass)
- Girizu EA2/NV-042 (quite steep,starting on Ibañeta, when aproaching Roncesvalles)
Summit near Espinal:
- Berregu EA2/NV-076 (next the Mezkiritz pass)
Summit near Pamplona
- Erreniega EA2/NV-092: you have to cross this range at mid height. It would be easy to arrange a lift on my car to approach the summit, if I’m available on these dates…
Summit near Estella:
- Eskinza EA2/NV-148 (drive-on summit)
- Monjardin EA2/NV-121
Afterwards you move into La Rioja region. I can not assess much from this point onwards. Most part of the trip is quite flat untill you arrive in Leon region (EA1/LE) then Lugo (EA1/LU) where there is again a mountaneous area.
The easy way to accomplish SOTA for any of you would be to count on a local ham that could join you to do an activation sharing the car or even equipment (so that you can get rid of extra weight) and helping shortening the trip to the summit.
Count on me if I can. Please let me now on your dates as we approach.
You can contact via my mail (QRZ.com).
Stay tuned, 73 de Ignacio