I always liked "on the one hand," "on the other hand," "on the gripping hand," which was based on an extraterrestrial anatomical feature of the Moties from the classic sci-fi novel
Don't Create the Torment Nexus The Mote in God's Eye (1974) and its sequel,
The Gripping Hand * (1993). I remember in the 80s, the "one hand/other hand/gripping hand" phrasing would show up occasionally in the sci-fi fanspaces I frequented, confusing people who hadn't read the book and sparking discussion where fans could talk your ear off about it.
But Phraints/Thri-keen/Aspis/Diopsids work, too!
* I read the Wikipedia article, and it mentioned the reviews called it "unnecessary" and "unmemorable". I checked out where I can access it and found that I have access to it on an ebook site -- and read it twenty years ago! So, I can confirm the "unmemorable" part!