I am probably overthinking this but here is my quandary. I want "somewhat" clean look, in the sense that I do want internal cable routing but not all the way. I don't want to use integrated bar-stem that Carbonda sells with 707 but rather a separate stem and handlebar. From handlebar I wish to externally route cables into the stem, then into fork and frame to their respective destinations. In short the handlebar is external routing and rest is internal. Am I making myself clear or is it even possible? I sent this query to Wing and he sent me CAD diagrams of two different forks a)external routing where I can see there is a hole on the side of one of the arms of the fork. b) internal routing fork which has a hole in the middle of the fork stem.
Along with that he sent 3 different top cap pictures, one doesn't seem to have any holes in it while other two have holes. One of the holed topcap is "FSA standard" and other one is just 4 holes next to each other.
I haven't ordered yet but as a precaution added all three top caps ($5/ea anyway) to my quote along with fork with hole in the middle  What else do I need to add.. spacers with similar holes for cables in them? I see that Velobuild sells GF-002 frame with independent stem/bar and is still able to hide cables also a user report confirmed that who built GF-002. Checked with Wing and he said they don't sell any such stem that allows internal routing.

I also ordered the different top-caps, to keep the options open for the future.
For the time being, I use the top cap with the 4 holes and routed everything externally from there on out.
This still gives it quite a clean look, while maintaining some level of flexibility.
More happy than expected with this solution, as it is pretty budget and weight -friendly.

Anyway, check out the FSA NS SMR stem, this has the feature that you are describing.
Not 100% sure the interface with the top cap is the same is with the compatible ACR system, but it does look like it.