Stella made some very nice bikes. If I were in your shoes I would equip it with some old Nervar or Stronglight cranks that will work with the bottom bracket you have and are available at reasonable prices. Just make sure the teeth on the chainrings are good since finding replacements can be time consuming. TA cranks are another fine French possibility but tend to be more costly. Check Sheldon Brown to figure out whether your bottom bracket spindle is for double chainring or triple so that you get the right replacement. My recollection is that most of the Nervars were doubles.
Brent