Thank you, everyone, for the amazing replies, and the amount of support you’ve shown for myself and partner (surprise, @lavenderwitch, I’m in your forum, posting on stuff XD).
I’m kinda low-key opposed to the “P” sound names, because part of the issue is other adults hearing the child, and making assumptions because the name invariably mutates into something that barely resembles the original.
We’re currently rolling around “[name_f]Oba[/name_f]” as the word, to see if it feels right, but I’ve got to admit it’s not…really hitting my “what I want my child to call me for their growing-up memories”, and intersecting with the word for “Grandparent” is an additional side-concern.