I think that's quite doable, but might be a little ambitious if you don't want to rush, and want to spend some time relaxing and enjoying the towns you stay in. I would check out the stages on Gronze for the Norte and the last two days on the Frances:
El Camino Francés es el
Camino de Santiago en el que confluyen la mayoría de las vías medievales de peregrinación europeas, siendo por tanto el camino de mayor relevancia histórica y el más seguido por los peregrinos. Su punto de inicio, hoy en día, tanto puede considerarse Roncesvalles como...
We have 3 or 4 days left to finish our current Camino del Norte next year, and it will (have) taken 12 days walking from Cudillero (just past Muros de Nalon) to Santiago. Some of those days were 30+ kilometer days, which I might not want to count on until you've gotten your rhythm and you're sure that's right for you. You might want to consider starting in Cadevedo or Luarca instead.
A Camino day can be pretty full, and sometimes there may not be a lot of time for sight-seeing. There are usually a couple of hours of things to do on arrival in town (shower, wash clothes, shop for groceries) and dinner will be a couple of hours affair too, if you go with the flow of Spanish dining. All that said, you may find the sight-seeing on the way (especially on the Norte!), and the slow pace of walking and doing the chores, might satisfy your need for doing things most days.
Buen Camino!