Not answering your original question, Robo, but I'd suggest a short 3 to 5 day jaunt from Burgos, the Camino St Olav to Santo Domngo de Silos. Very different from the Frances.
Very quiet.
Burgos to Modubar San Cibrian, 18km, almost all off road on a Via Verde
San Cibrian to Mambrillas de Lara, about 29 km, a lot of road walking but
genrally very quiet and enjoyable, except for near Revilla de Campo. This can be easily broken up into 2 shorter stages by staying in Revilla.
From Mambrillas to Santo Domingo de Silos, 28kms glorious and almost all off road. You can break it into two by staying at Covarrubias, 18 km from SDdS
Or for more time out there, you could do a stunning loop from Covarrubias to SDdS and return, staying at SDdS.
http://www.wikiloc.com/wikiloc/view.do?id=7862376
And then return to Burgos a different way--on the Lana, via Mecerreyes. That would be altogether a 5-8 day loop through beautiful, very historic, and unpeopled countryside.
But. Sorry, no albergues, except the ones at SDdS and Mecerreyes.
Very sweet CRs and Pensions.
Your OP? There's a Camino job for you, Robo!
Happy planning!