I use psx seecon and I've added registrations to my AI aircraft so if the aircraft is in star alliance livery, it will show in star alliance livery. It was alot of work to set up but the results are worth it
We've been working on a new add-on manager which will make small updates like this easier in the future. How I start the A320 up when I use it is to load the 320 straight into the P3D, so select the paint I want, the airport and gate and select fly now. Then I connected the external power, external air and chocks and shut the engines off. That should provide you a good turnaround state and a 'clean' aircraft so to speak from which to start your next adventure.