Hmmm, possibly. I grew up around intellectuels (bobos - lots of professors, CNRS researchers...) rather than bourges, but the values are not strictly identical (although I guess in terms of diet, restraint etc, similar, but not for the same reasons).
The impoverished bourgeois are definitely who I consider UMC - unless you follow the American system of associating class with money! They are exactly who I was referring to in my earlier post about no longer having the old money, but keeping their traditional values. I think England is similar - there are lots of upper class people who live in draughty old farms and drive beaten-up old bangers, but remain upper class nevertheless :)
There is a family like the one you describe close to us - they live in a wealthy suburb, in what pretty much amounts to a shack! Their kids go to Scouts d'Europe and Catholic schools and they all wear "the uniform" (navy and white, velvet aliceband, boys in long grey shorts...). They are very generous and welcoming, though - our DDs are friends and they've invited us round for meals a few times. They all have hyphenated first names :)
I've also spent quite a few summers in Paray-le-Monial, which is a regular meet-up for lots of religious families (and have stayed in touch with several) and all are lovely, kind people :)