Thank you all for your tips and explanations!
Seems like there isn’t the one solution that keeps all the information of ACES but is capable of merging my render over a (ACES) white solid.
Rendering it with a white background in Mantra would definitely be best for overall quality but I have additional plans with it where I need it separate (and I can’t render in full quality twice).
Have to do some thinking on how to continue this, but as this is an exercise to use ACES I will probably force myself to get it done in ACES.
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