Giant Contend AR 2 Bike Rack Options Advice

I am looking for a suitable rack for my Giant Contend AR 2 (2026).

Here are the challenges I am facing:

1. No rack mounting points near the seat. Only small M3 holes on the seat stays
2. "Special" D-Fuse seatpost that is not a standard circle
3. Composite seatpost which I think might rule out the ortieb quick rack

The bike fortunately has rear mounting points by the rear axle.

My original plan was to use a seat rack collar ( https://www.tradeinn.com/bikeinn/en/giant-d-fuse-integrated-saddle-clamp/140983874/p ) but after this has actually arrived I can see that it is too big and clearly made for other bikes with the d-fuse seatpost.

Another option I have seen online (https://www.youtube.com/watch?v=UvRigg3mnvU) is to use an d-fuse seatpost rack mount however I have the same concerns with having a carbon seatpost.

Edit: According the ortlieb, their quickrack does support carbon seatposts, do know where I thought I saw they didn't