so you should be able to check the registry to see if it is LTSB and you can use the version of the OS for the second part.
You would need to use some type of credential to connect to the network share, but you could do it.
What I would probably do is create a batch file via the fixlet. At the end of the fixlet it could run that batch file.
You could also have it prompt you for your user name and password so you don’t have to hard code it into the fixlet.