You could use one of those and then an m6 threaded rod connector. Annoyingly m10 to m8 is a common threaded rod reducer (connector that’s female to female) but I can only find m8 female to m6 male with my googling. I’d wrongly assumed they were readily available like the m8-m10.
I need three. Well, I might. I might not need any. Was just looking to see if they existed