If you don't go with the persistent USB install, you'll need to remaster the ISO. ISO files are read-only no matter what media they are on - CDROM, or HDD or flash. That type of file system isn't able to be modified. We can't just mount them and modify files. Remaster. There used to be an Ubuntu Remaster tool that would create a CDROM/DVD from a running Ubuntu system, but when EFI came, we lots lots of utilities which were pretty great.
Or just learn to get by without powershell, since there are many already included scripting languages on the ISO which are more powerful. Heck, I bet there's a powershell-to-X converter where X is bash, perl, python, ruby or even awk.
If a month of not using powershell, you'll not want to go back.
Most of us here are converts from other OSes.
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