French Numerical might help.
I found this article whilst Googling -
Numbers on the Belgian keyboard
If you opted for the French or Belgian Apple wireless keyboard, you
may experience a strange behavior when using the number keys. On the
AZERTY keyboard, the numbers appear on the second top row of keys,
together with the accented and special characters.
Apple Wireless keyboard frHowever, it may be so that when pressing the
Caps Lock On, you still get the accented characters instead of the
expected numbers. This is a bit of a challenge when needing to enter
series of figures.
If so, you have to change the default keyboard in the system
preferences, to “Français – numérique” instead of “belge”. Go to
System Preferences, in the Language and Text section. Then in the
“input method”, select the “Français – numérique” keyboard, and
deselect the “Belge” keyboard. From now on, when Caps Lock is on, the
number keys will actually return numbers.
The Keyboard Control Panel has changed slightly since that article was written - it's now accessible on a separate sheet, after hitting the + at the bottom of the pref pane.