"Fake it till you make it!"
I always tell my students this. As long as you don't stop, just keep going. The judges/audience doesn't know your form anyway, so they would never know.
One of my students has thus far, performed about a hundred different versions of the sword form! I have never seen her do it twice the same.
Now, my SPM teacher also does this, but for him, it is the style expressing itself through him, and once it is inside you, it becomes spontaneous.
(that is now the excuse we use every time we eff up...)
"My Gung-Fu may not be Your Gung-Fu.
Gwok-Si, Gwok-Faht"
"I will not be part of the generation
that killed Kung-Fu."
....step.