Linear versus circular and circular versus linear, is always a challenge. Some bods want A to B to C (linear) and some want A to B to C to A (circular) Me? I'd find a decent spot somewhere near where many of the routes pass through (or close'ish to) and anchor myself there. I'd then fill in the gaps with a Michelin map. I'd guess none of the D and lesser roads are going to be hugely busy? Having a car, so you can at least drive to a sensible jumping off stop and return to it later, is a big advantage.
Enjoy yoir holiday
Thankyou
Tbh. that may well yet become the plan as it would save a lot of faffing about and if we find a nice pleasant place to anchor it'll be worth staying put.