I think I finally found the term that works best for me.
Soulbond has always been... a little too spiritual for me. I don't absolutely believe in A's or anyone else's absolute independence (sorry, love you, but sorry). I cannot entirely discredit that they are all just... a part of me originally.
I found Munbond and knew. My original experiences with plurality all came from roleplaying, having someone specifically have a label for this situation- specifically for writers and their muses- just... it feels right. Specifically that they feel stronger when interacted with. I can hold on to them for so much longer when I'm talking with them, but they do usually fade if I'm not actively keeping their connection going.
They are still soulbonds, and I think A prefers that term, but I like this microlabel even more.