Well, unfortunate for you that ASUS typically has a longer delay for markets outside of Taiwan/Asia. They have not been able to invest and expand as much in its phone department as it has for its desktop/laptop/motherboard departments :v
This time the backpack clip seems to be delayed in Taiwan as well (?). Previously, customer service had replied that it is planned to be on the shelf in mid-September, and things probably didn't go as planned. On the other hand, the Connex accessory is now available, but I don't think you care about it at all 🙃
Either way, Zenfone 7 Pro is a fun and great phone overall (I love mine 🙂), so I think it's worth keeping as a spare phone.