Adv Resolve / Fusion workflow - graded clips in fusion 3d

I need to do this:

Reduce the pink in the presenters clothes and skin in the shot below

So this is a 3d scene in Fusion in Resolve.

First - I edit talking head footage
remove the greenscreen from my talking heads footage
grade my talking head footage

then

Second - I edit my various background footage into 4 key sequences
grade the same various background footage

[up to this point is super easy... but now....]

I need to place my keyed talking head footage into a 3d world where the various background sequences pop in and out from various start points [imagine a training video where the person says blah blah - and now do this and points to footage that comes into 3d space]

So now i take the talking head footage and open fusion tab and make it all work - but I have to render out background sequences each time (and tweak color on talking head in CC in fusion (cause fusion happens before color tab - or render out alpha footage of talking head)

And ideally I need to tweak each color grade as I bring them together

I currently render out a whole bunch of sequences - and then have a timeline for the fusion 3d world - but since fusion is built into DVR - so my question: I imagine there is a better way to do this? In my dream it is some type of reference clip that can be used in fusion and some pre-multiply option in grading for clips with fusion (where color tab only affects media In)

Make sense?

thanks

bump