Help! Last minute route advice

Gday all,

So I'm on a last minute trip (i type this while on the ferry, just left Dover, UK heading to Calais, France)

My plan (as it stands) is to cycle down France mostly along Eurovelo 4, 3 & 17 to Barcelona and fly home from there.

Anyone have experience with this route?

I'm open to other ideas, especially one that involves a circular route back to Calais/The Hague to get ferry back to UK, and skip flying with my bike.

Photo 2 is another option, if anyone has experience of touring in this area? What's SW Germany like for solo touring?

I'm sold on visiting Paris so I will head there for sure

I toured flanders and a bit of the NL last summer so not keen on doing that as the main dish.

I am on a fully loaded bike weighing approx 45 kg, i have 36 days, aiming for 25 days cycling at around 70km

I will be wild camping, hopefully find some warmshowers hosts, and hostels in cities. Maybe the odd hotel/guesthouse as last resort, if I need.

Any help or pointers most appreciated!