Mr. Généreux, I understand what you're trying to do, but from a technical perspective, the amendment Mr. Godin is making to point four of the original motion, which you want to amend, consists in a change of date and has nothing to do with inviting witnesses. According to the rule you can't change an amendment through a subamendment if it doesn't reflect the sense of the main amendment.
On November 1st, 2022. See this statement in context.