Jagroid seems the best option particularly if you want to keep all the original charm too. However you can replace the whole unit all together with an after market set up from China. I’ve used a supplier via AliExpress called EKIY to convert combined stereo and climate control units in three different modern classics. In each case I bought complete plug and play units that also replaced the heater controls and part of the dash. That gave me sat nav, Phone, AirPlay and Android touch screen controls, integrated reverse cameras and 6 Birds Eye cameras plus tyre pressure sensors via Bluetooth and of course WiFi and internet. One of them also connected to rear headset screens. The whole package in each car came to between £300 and £500. They asked me for photos first in the case of the Mitsubishi to make sure I got the precise set up connections. The Audi and Honda were simpler but I was surprised how good the communication was before and after purchase.
It was only after buying my X Type Sovereign that I realised it had Jaguar voice control, sat nav and Bluetooth phone connection and that took all of about five minutes to configure. I love the originality, I’ve even bought CD’s again. Consequently I’m not going to change my set up. Much as I like gadgets (and they were a huge advantage when selling the cars) I never sat in the back, never watched a video or looked at a website while sat in my car and I still have a tyre pressure gauge in the glove box lol. I certainly never needed to see a continuous view of my car from above 😂 But “whatever floats your boat”. The buyers were in awe of it all.