The user noted:
so it didn’t seem like an unreasonable question. I think it would be good to know if the software @jeanphilippeb made is meeting people’s need for this or not. He might be able to repost if there’s interest.
That said since OPs specific question has been answered, if there’s continued discussion of bulk adding a project, we should probably continue that on the existing open thread:
https://forum.inaturalist.org/t/batch-adding-to-a-project/40074/6