The offline version is on izzyondroid.
The design is worse, yes.
I don’t think it matters much because most of the time you only see the autofill thing, not the app.
When you do go to the app, it is to select between multiple credentials, which is still a split second action.
On mobile I have my 2fa in a different more convenient app (aegis), though k2a does allow to copy 2fa codes
Two half-size batteries for the price of three full-size phones coming right up