Although it may seem belated to provide this suggestion, I strongly recommend opting for the £400 installation of the MB.
The vehicle enables the user to exercise control over many functions via the manipulation of the steering wheel. Additionally, the user has the option to respond to incoming calls using the loud speaker system. In the event that the user deems the conversation to be of a personal nature, they may elevate the armrest and retrieve the phone cradle, therefore facilitating a private conversation. The engine may be deactivated, while the phone and steering wheel remain operational until the termination of the ongoing call.
Retrofitting is a feasible option, but requiring more effort. As an example, the expense of retrofitting it to my machine learning (ML) model would amount to around £300 and require half a day's worth of effort.