Transport equipment conversion assistance

Hello, first of all hello because I’m new here in the forum^^ I have the following problem. I broke a few brittle vertebrae when I was thrown at a street lamp by a motorcycle accident. the problem is that I don’t have so much power in my legs yet, and therefore need an automatic car. I would also rather have a car conversion with which I can brake with my poor ones. gas-giving is with the right foot no problem at all, only with the brake I am simply afraid that I will not brake properly in the decisive moment and then I will run over someone or something bad happens. the function of the legs etc… is again fully there – just not yet as strong and responsive… so I would like to ask: – is such a conversion possible for me to every vehicle (BMW e46)? – how much does that cost?(I am only 18 and therefore no millionaire^^) – do you have to take directly gas and brake or there is also brake individually? – will the cost be I hope here are some who can understand me and help me… greet BG