@msi Sorry maybe I wasn’t clear. Your batch file route can be saved as a .bat (but is probably better saved as a .cmd). You can deploy that as a snapin just as I had outlined.
The second part of my comment was to the reason why you are doing this. If you have to fix 100 computers that have already been deployed then the snap in route is the correct one. If you are doing this because you will deploy 100 computers in the future, then there may be another path you can take. One example is if you sysprep your reference image, then you can place batch commands in the c:\windows\setup\scripts directory. After windows setup is done, and before the login screen is presented to the user, windows setup looks in that path for a batch file called setupcomplete.cmd. If it finds that file it will run it before the user can login. There is also a way to have the windows unattend.xml file run commands or add users during its execution. Which can do the same things you are doing in your batch file.
These are all different ways to get the same results. The simplest is to create a batch file snapin like you talked about.