tro11,
I can’t tell you whether or not it’s a bracha l’vatala to say a bracha which you don’t mean. I can tell you with certainty that saying a bracha which chaza’l did not institute IS a bracha l’vatala.
I can only advise you to work on yourself so that you can accept chaza’l as wiser than yourself and say the proper bracha with the proper intent.
I appreciate the compliment, but if it’s cute, that’s incidental. More importantly, it’s true.