I biked from my front door in the Netherlands and back several years ago.
I wasn't too worried about following an "official path" until I got to St. Jean, then followed the CF to Santiago. After a pleasant diversion to the west coast back to Santiago then north towards Santander, the coast and towards home, criss-crossing a couple of other Camino routes.
I did not view it as a "Camino in reverse" but as a chance to explore Northern Spain with a more "normal" and freer schedule. I did not stay in Albergues on the return leg, as an example. St. Jean to Santiago was my pilgrimage, the rest was my bike tour.
I particularly enjoyed it as it gave me a different perspective to Spain than the Pilgrim one.
People were invariably concerned for me thinking that I was going the wrong way but it led to many interesting encounters.
This year I travelled parts of the CF in reverse (again on a bike), preferring to camp rather than use Albergues. It felt very different to going the other way and not something I'd be in a rush to repeat.
If you enjoyed your Camino, have no regrets and some time I'd suggest to explore the non-Camino side. Otherwise look to walk your favourite stretch or the part you feel you didn't appreciate properly again. Or another Camino, altogether