I just wanted to follow up on this for anyone else that might had my seme question
I have done few tests, maybe not extensive enough but that made me confident to bring this workflow into production and I must say that so far using ACES Ofx as IDT and as RRT/ODT worked just as expected and feel solid
Plus having access to camera source prior IDT gave me the chance to transform camera shot in 2.2 gamma curve to work much better in hdr.
Same camera in a conventional project based aces pipeline gave me some nasty highlights and saturation in hdr.