Recent versions of InstallShield have a driver install wizard that is a
convenient ‘front end’ to creating a DIFxAPP based installation of a driver
(component).
I am not sure I understand your question
You do have your own install package, right? You are using InstallShield to
generate an MSI that installs your driver (and presumably other stuff too).
Please ask again if this is not a helpful answer.
Good Luck,
Dave Cattley