Blank Preons for alts?

So I’m trying to compile my fonts into a character format where each character has alts and I’m running into difficulty with preons.
The one I’m currently stuck on is Rey, who only has a preon on one font, and I’m wondering if I can substitute it in the other fonts with a silent preon.

As in a .wav file with no noise.

Sure, you can do a silent wav.

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Thought so but wanted to make sure.

Thank You!