Part of the problem here is that people are quoting and interpreting Canon Law who have no business doing so.
I am in the exact same position as you are, my husband was baptized Catholic as an adult by a Dominican priest at his parents’ parish, was not confirmed, and we were married. We are validly married. The priest who married us knew he was not confirmed. Now, my husband does not want to be confirmed, I cannot force him.
What is done in practice is not always what is written, and what is written requires interpretation by those who are qualified to interpret, and the determination of what is grave inconvenience is up to the priest or bishop, not some poster on a message board.
And to another poster who stated the priest must have been treating him as a non-Catholic, that is one of the most absurd things I’ve ever heard. The poster was not even there, has no clue as to what the priest was thinking, and such a thing is not possible if one is baptized as a Catholic.