Mtwind103,
If I only had 10 days, I would catch a bus to O'Cebreiro and walk without interruption to Santiago.
I've done it in 7 days, so you don't need to rush in 10 days.
With only 10 days, you want to really enter into the world of the authentic pilgrim quickly and live it to the max. Blowing a couple of your precious days on the bus with change the experience, and not for the better.
Also, since time is limited, take a local airline from Madrid to Santiago and bus from Santiago to start your pilgrimage. When you are done, take the local airline from Santiago to Madrid and hop on your plane home.
Other than that,
Good luck, and God bless.
David, Victoria, Canada.