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One problem to be aware of though, a lot of old french bikes have on the rear brake mount a vertical mount whereas today brakes mount with a bolt that go through horizontally (if it makes sense). Just in case you were planning SS with brakes or anything similar
EDIT: also quill stems on old french bikes are 22 mm diam (instead of traditional 22.2mm)
EDIT2: aaaand the threads will be in French standard (BB and headset), seatpost very small (diameters as low as 24, etc.) etc. etc. etc. you get the point
Realize 35+ guards might be a stretch. But i wanna run at least bigger than classic road tires.
I'm more thinking pre-1960's french porteur. Maybe time to drop the idea of finding an OTP frame and start scouting Leboncoin.