Hi, wow, I feel your pain!
When are you scheduled to sail home?
We (Wife, 2 kids and I) are currently in Baden not far from Cernac and are marking our way back up toward Cherbourg in the morning to sail back on Sunday. If I can be of any help let me know.... I don't speak any French though. !
I did a quick search for recovery companies and found this link with companies details and locations
http://m.europages.co.uk/companies/France/breakdown.html
I see one in Cherbourg 'Fresh Marine Service'... same thing them coming down to collect and bring back to Cherbourg. There may even be a company closer to where you are on the list that might be handier.
As Sprinter said someone to translate would be really handy (assuming you don't speak french of course!). If not, then google translate on your smart phone is invaluable.
Why will it take until Wednesday to see if it's fixable?
I hope you get it fixed and get motoring again soon.
PS: I recently had to get my 7mtr long x 3.5mtr high camper recovered from Arklow to Donegal and it cost me €430 just so you have a reference point on what it cost at home.