Since you will be visiting Paris before beginning your pilgrimage here are two Parisian accommodations sponsored by religious groups; the
Frères Aveniat and the Benedictine Sisters of the Sacred Heart at the
basilica of Sacre Coeur.
For secular accommodation in Paris have you tried
CouchSurfing,
AirBnB or searched
Hostelworld for individual rooms?
Check out this earlier thread for other suggestions where you might stay.
https://www.caminodesantiago.me/community/threads/where-to-stay-in-paris.34286/
Do scan these earlier Forum threads for much more about pilgrim sites
in Paris and the
camino within Paris.
When on the parvis or place facing the
Notre Dame cathedral below you underground lie
Roman ruins and visible to your right across the Seine begins the medieval rue Saint Jacques which pilgrims followed to leave the city; walk it a bit and ponder history.
Take a deep breath, relax and just
enjoy it! As an American who has lived 35+ years in France both in Paris and Champagne for me as Thomas Jefferson wrote “
a walk about Paris will provide lessons in history, beauty, and in the point of life.”
Bon Chemin and Buen Camino!
PS. A good way to see a lot of Paris quickly is to take a bus tour. Check this web for various possibilities/prices.
http://www.freetoursbyfoot.com/paris-bus-tours-best/
PPS Check this web for how to easily/cheaply travel from CDG airport to downtown Paris.
https://www.paristoolkit.com/airport/paris_cdg_bus.htm