Why isn't a TB Satellite an option? Connection chain will go Mac > Satellite > Apollo
I'd recommend this over using FW which has bandwidth limitations.
And in any case, do understand that the Satellite DSP will not be available in Console live on inputs; only in the DAW while mixing.
I think the FW would work, but it's an old tech that is limited. (and yes, it would need a registration change, it's just a form the owner submits.)