When the character/face is complete and player clicks Done a LAL dialogue box pops up asking if player wants to continue with vanilla start or choose alt start scenario. Start off where the Husband/Wife are at the mirror.
My thoughts on the leading into the Alt Start part of what this mod would offer. So by now you've been through the beginning a couple times right? My only concern is that it's not generally intended to be 'alternate game story' but 'alternate start' and working in how to deal with Shaun could present some problems.