No idea how much will be the cost. Some days back, I have seen a video where (in Delhi or Punjab, am not sure) some guys installing Tesla HU with all kinds of camera attachment and believe the huge HU was costing under 20K. I will try to trace the video, and if available will post here.
May be, you can check with your dealer (definitely he will not agree unless you do the installation from him provided he has the people to do it). It is better to do after initial warranty is over?
Fixing a front camera is around 45 minute job. I have recently fixed front parking camera on my car (
Read here). Again, your HU should be able to accommodate the camera connection. Since I already fitted a Blaupunkt Android HU, it was easy to connect the Blaupunkt front parking camera into the HU (more details available in my thread)