MacOS LAPS Joshua D Miller How to change MacOS LAPS password to only use characters

Hi all, 

I want to implement MacOS LAPS by Joshua D Miller. However i want so that the MacOS LAPS only consist of characters and numbers (up to 17 characters as well).

How do i do this?

I managed to create a policy to install the MacOS LAPS package in jamf pro (cloud). I install the swift binary package of MacOS LAPS. and I create another policy (that run weekly) to reset the password