The word "gi" is also a romanization. So is "tsunami" and "matryoshka". Going further, the word "alphabet" is a romanization of ἀλφάβητος in Latin

so any borrowed word from a non-Latin alphabet is a romanization, that's not a sane criterion (κριτήριον)

You obviously don't hang out with people into pseudo-eastern 'philosophy'. I know several people who use it regularly.

Of all the 'weird' two letter words mentioned, I'd consider qi probably the most reasonable and common, and certainly one that I actually hear used

Especially with it being the name of the defacto standard of wireless charging.

A brand name, yes, but from an actual word.

It was also the name of a promising, but ultimately failed, display technology[0].

[0] Anybody else here remember being both very excited about, and then very disappointed by, the Adam?

https://en.wikipedia.org/wiki/Qi_(standard) I see this usage here more often than the mysticism one.