Would you like to keep things as simple as possible, or would you prefer to encumber the process with color management that is often beyond your control and adds transforms that some people really don’t like?
If your project (apparently) is rec709 straight-through, then choosing to overlay a color management process is just adding a layer of complexity that is likely not necessary. Alternately, if there is some reason to comply with, for example, an ACES workflow, then choose accordingly. Input colorspace (IDT) should match your acquisition, so that the appropriate linearity is reconciled with the Source Space : Display Space transform. Any intermediate colorspace… ACES, Blackmagic, et al., are really just intended to establish a common exchange so that media is interpreted and placed correctly and then re-tabulated for its intended export reference.
Your project appears to be entirely linear. It would be like planning a trip from your house to visit next door, but wondering if you should go to a different neighborhood first. Walk.
JPO