Hard to know how would that work
BUUUT
There are some creative ways to use them together… not gonna lie, it would also suit Sanji’s style because it will mainly be used for protection to someone else…
a creative idea would be… pin pointing the location in which you can use the barrier of CoC haki to prevent someone from getting attacked by someone else… and naturally you can use it to pin pointing who would you knock out from the crowd… knocking out enemies and not any allies especially you don’t know the faces of everyone…
but the first use is so much more unique… for example imagine Sanji is fighting someone really powerful and got his hands full
And Nami on the side is about to get hurt by someone else… IF CoO and CoC were combined, he might be able to pin point the exact location to where he can create a CoC barrier next to Nami to prevent that guy from landing attack
So, my point is it can be used ALONG side CoO but not infused with it, at least what I think
unless Oda will make some god level shit where he infuses both and do stuff like Mind manipulation / altering your thoughts (because Coby was able to read emotions or thoughts) same with Sanji with ladies or Luffy with others… and rayleigh said it’s CoO
so, who knows, maybe it enforces that ability to where you not only get into their minds and read it, but also “intimidate it” and alter or manipulate it
which will be god level shit…for example you can be like code geass
Or in battle against strong willed enemy you affect his sense of observation by making him read your movement wrong
for exampe, someone who can see the future might see a WRONG future which ends up in him getting fucked
The point infusing CoO with CoC like that will be massive, much more massive than CoA… it’s some god level shit, and I wouldn’t recommend that because too much hax leads to plotholes