An OFX Color Space Transform to ACES is not quite the same as the corresponding IDT (compare the OFX ACES Transform version of the same thing) as it does not include a chromatic adaptation, which an IDT needs.
Hopefully the full set of BMD Camera IDTs will be added at some point.
In the meantime you need to use slightly complex approaches, such as first using an OFX Color Space Transform to go to a colour space which has a D65 white and for which an IDT is available. Likewise, to go from e.g. ACEScg to Pocket 4K Film, you would use an ACES transform to go from ACES cg to something like RED Wide Gamut/Log3G10, and then a Color Space Transfrom to go from RWG/Log3G10 to Blackmagic Pocket 4K Film.