Most of these things are possible, just not as easy as they could be:
You can load a different faction in the control panel and then add the models to an existing crew. So, for the Nicdem/Killjoy example, add Nicodem, switch to the Outcast list then add Killjoy at 11 instead of 12.
Some of the items listed will require better auto filtering. But this means that the models would need to be filtered based on Master, not faction. Something to think about...