Sorry, I don't understand what your issue is - you clearly can't do the trip on CHAdeMO alone, but you have ports within 100 miles and it should not be a problem to get that one extra charge from a Type 2 or Type 3?
You've got to start with the premise that "I'm going to do it" and then look for the most efficient route.
Camp sites often have Commando 16 Amp and you can make a adaptor for <£10 to use with the 'brick'.
If you wan to borrow a Type 3/ J1772 cable - then I will let you have it (for the duration) - for a donation to Help-for-Heroes?
However - I need it from 27 May to 15 Jun. I'll be doing Belgium, Germany, Austria, Switzerland and France in those 2 1/2 weeks!
Le Mans should be well within your 'comfort zone'!
The money save on petrol will pay for a lot of Moules/Frites!