We did this in 2015 and I can tell you where we stayed. Of course a lot may have changed between then and now. I'll start by giving you this name and number
Pascal du Chene, chairman of Fr Belgian Association 0032 – 65623479
dychbona@hotmail.com pascal du chene ph daytime mob nr 0032 479 982563 //// will help if need be
This link may be of help to you as well -
We stayed in Brussels - Nivelles - Roeulx - Maubeuge - Avesnes sur Helpe - Bohain en Vermandois - St Quentin - Berlancourt - Chiry Ourscamp - Compiegne - Fleurines - Chaumontel - Sarcelles - Paris
You will just have to be creative in looking for places to stay i.e. Chambre d'habitant, Airbnb, Hostels, Roomlala, Cheap hotels like Premiere Classe, Hotel N, Ibis etc.
Compiegne has a pilgrims hostel
Your route will be the GR655.
I hope this is of some help to you. When you decide to take an alternative route it usually takes a bit more preparation indeed
Buen camino