You could be more subtle and use the CPS2 version of Ken’s ending theme.
Oh and btw, unless she’s really into SF too, this is the dumbest idea ever. Your fiance will most likely want this to be the best, most perfect day of her life. To suddenly hear Guile’s theme when she’s walking down the aisle will not fall within her definition of perfection.
This is one of those ideas that’s like, kinda funny in your head, but you quickly have to wake up and get back to reality. Not playing the Guile theme is probably not something you’ll regret later in life. Scaring off your fiance however, will be.
So yeah, go ahead with it if you want, but don’t be surprised if she runs up and Flash Kicks you in the balls.