I'm sorry I can't help with any answers, but you asked the very questions that I have. Next summer, I'm contemplating making an appointment with Silverleaf for around the time that we plan to go to the FMCA rally in Coos Bay, Oregon to do exactly what you are thinking about. Our '06 Dynasty probably would likely face a nearly identical conversion plan.
Regarding the GPS piece of the system, we are now using a Garmin GPS, instead of the outdated and un-updatable GPS that came with the Kenwood system and the Aladdin. So that frees up the space from the GPS DVD reader for the possible future installation of a good over-the-air radio or satellite radio. So that would take care of two of the functions of the Aladdin system. That would only leave the cameras and the engine, trip function and coach related systems functions to take care of with the Silverleaf.
I'll anxiously await responses from folks that have "been there, done that."
Jim & Angie, Boise, ID
2006 Monaco Dynasty Countess III
2017 GMC Acadia Denali