If you can't be bothered to use the correct terminology, you will be of little use to your prospective students.
I query the motivation of someone who obtained a FAA CFI rating 'just for their CV'.....
In the UK, CFI means 'Chief Flying Instructor'. If you go around calling yourself a 'CFI' when you are a mere FI(R), you won't be particularly popular.
Why do you wish to become a FI?