Unsure if this is available in 7.0, but theres an option right now in the latest SD installer that lets you only run pieces of the post-install you want to run (in this case, I'd just run the piece to deliver the profile definitions)
If this option isn't available, you might have to open up PostInstallWizard's package and write some semblance of a flow to do this yourself. I'd contact support to help with this either way.