No, no. If he were doing a subamendment on the amendment, I'd allow it, but the thing is that the amendment kicks in after “per”, taking out “recognized political party” and adding in “member” in place of those three words. So what you're doing is going back to the main motion, changing the time limit from five to ten, and for that reason, it's an amendment, not a subamendment.
Is it clear?