'Bienvenue à Marly-Gomont' should be available to watch via Netflix UK and USA under the title 'An African Doctor'. This doesn't seem to be the case for 'Les Rivières Pourpres' ('the Crimson Rivers') or for 'La Gloire de mon Père' ('My father's Glory'). DVD is the next best thing, I guess...
We chose not to put streaming services information for these films as these platforms' offer differ greatly from one country to another, and also changes often, so we didn't want to give misleading information.
I hope this is helpful.
Bonne journée !