On the one hand, the Stronglight uses a "technically" obsolete removal tool and harder to source chain rings. Both tool and rings are out there and if one is patient bargains can be found. I still have a set on my favorite zippy bike, a '71 Gitane set up as a fixed-gear and they are lovely and work beautifully.
Should you choose to replace it, pretty much any standard BB and cranks will fit. A trawl through the rabbit hole will provide a sense of all the bits people have successfully used on this model, which is revered for its flexibilty.
Keep the brakes - they have sufficient reach and with good pads, cables and housing work as well or better than most. Service the hubs and if they are still good true the rims. Snobs sometimes mock the plain jane Weinmanns but they make for a nice full width tire that handles road shock well.
Which Huret deraiileurs do you have? Catalog spec is for Challenger which is allegedly an underrated underappreciated classic; some got upgraded to Jubilee, a nifty collectible in itself for its feathery weight and diminutive cuteness ....