Just a few thoughts based on experience. I've learnt that it's best to let your headunit be your headunit, your phone be your phone, and your satnav be your satnav.
I've seen alot of the cheap headunits be very buggy, same with software on a car pc etc... so I went with a Kenwood headunit that has wireless apple car play etc... It just works perfectly every time.
Satnav you want in your eyeline, and not having to keep glancing down and taking your eyes off the road, especially when we get on it around Europe on custom forced routes on twisty back roads. At the same time I run Waze on the headunit with voice alerts and only look at it when needed.
You really don't want to go back in time with mounting switches etc... to the dash mate, keep it simple and OEM. You don't need to be constantly switching boost maps or traction control, I'm willing to bet you will put it on the maximum boost setting and you will never touch it again like most of us lol
You also won't need to be monitoring things like the old days with nasty gauges everywhere or on a screen. Just keep it simple and fit a Toucan for the Link ECU, and let it do it's job for you. You can change all your settings from there if you wish, traction control, boost settings, monitor things if you want, but the main benefit of fitting a Link ECU is all the safeguards, and in turn the warning alarms that can be set up on the Toucan. it will bring to your attention anything you need to look at. Then you can spend more time on driving and enjoying the car And the interior will look clean, simple, and OEM++