I can verify this works with minimal issues. No more issues so far then playing with regulars. Would be a huge mistake if Larian doesn't make this available. I have enjoyed the game much more playing with 4 custom peeps. Honestly I could never go back to the regulars NPC's.
I did this too. ALso note: For me at least I had to run the directX version of the game to tab out and back in. otherwise I ended up with black screen and had to manually shut the game down with task manager