Assuming that your bottom bracket is French-threaded (almost certain, but should be verified) one option might be:
Find a TA Cyclotouriste (Pro 5 vis) or Stronglight 93 or 49D crankset on eBay. The 93 may be easier to find replacement chainrings for if you need to do that (# teeth or condition).
Find a TA (aka Specialités TA) or Stronglight bottom bracket on eBay with spindle length 118 mm for double chainrings (dunno for triple) -- either one is OK.
Alternative, cheaper:
Get a sealed-bearing bottom bracket from Velo-Orange.com with French cups. These have JIS-standard spindle ends; so:
Get a Japanese (JIS-standard spindle, not Stronglight or TA) crankset -- in much more plentiful supply. And you could go with 110 BCD (bolt-circle diameter) cranks to put smaller rings on the set, if you like.
The crap-shoot here is you need to know what length spindle you need for a given crankset. Stronglight and TA used 118 forever (and more recently, not, I think), while the various people making JIS cranksets are all over the place; plus the double or triple thing require different lengths, and then there's offset (spindle longer on driveside than non-drive side) vs symmetrical (which I believe VOs BBs are, but confirm).
To make it even more complicated, not all Japanese cranks are JIS standard -- some are Campagnolo standard (Sugino Mighty Competition, Suntour Superbe and Sprint, Dura-Ace AX for example), but these are high-end and the exception.
If you have a particular crankset in mind, then finding a bottom bracket to fit, even on a French bike, is easier than doing it the other way around. Sutherland's Manual (at least older editions) has pretty good information for spindle/bottom bracket mixing and matching with cranksets -- someone here can help you with what's going to work, at least in theory.