I dare say your definition of the meaning and usage of the word Protestant is only an issue with Catholics.
Protestants, such as myself, don’t give it a second thought.
All we care about is if our hearts are right with God, has he saved us, are we born-again in spirit by the Merits of the Sacrifice of our Lord and Savior Jesus Christ?
Has he changed our hearts, making all things new and old things have passed away?
Has he given us power over the sinfullness of our lives?
The answer to a true Protestant, is yes to all the questions above.
This is all that matters, are we right with God, and a true Protestant is.
All I can add to your remarks is that I find it laughable that anyone should think that God will judge them by the religious ‘club’ they belong to, regardless of their sincerity of belief, love for Him, or how they conduct themselves in this life.