Hello,
This is a question I have pondered so many times.
I am to walk my first Camino in July; and like you, have constraints on my time; and yes, I will be back to finish the Camino.
My heart decided that I could start only from SJDP; that way, when I return, I, return to continue my journey.
To me, it seems that if I were to start further down, then, unless at some point I covered the same ground again, I would never of done it all.
My first walk will only take me to Burgos, but when I come back to start again at that point, I believe that I will fully feel that I am continuing my journey, rather than skipping in and out here and there.
I guess that everybody has their own feelings on this......but I sometimes wonder how those who just do that last 100km really feel when they get to Santiago......would they want to expierience the begining ??
Whatever you choose......Enjoy your Camino.
Paul.