It really is a very short route to Le Mans, so finding operators to cover it might be hard - or it might be more expensive than you think.
Is it just me, or does some of the airport get used by the race rendering it usless for flying some of the time?
It is a very short runway if my memory serves me correctly - around 1000m.
STOL is definitely the only way you'd get in and out - or consider using the likes of Angers instead.
Or do no scheduled carriers or locos fly to airports in the area?