Hello.
Generally, it should be not very difficult: you buy transmitter and receiver for RC models, their distance about 500 m. Alternatively, it can be done by Wi-Fi but distance would be about 50m. I can design both methods.
Then, you have other two options: to put servo motors on existing controls (throttle, brake, etc.) or to connect the added equipment directly to the vehicle electric circuit. Needs detailed consideration. Again, I can handle both ways.
I'm an electronic engineer with about 25 years of experience, also about 7 years of experience in 3D modelling using SolidWorks. Experience with Arduino and ESP32 controllers. Good technical background.
Experience in 3D printing, manufacturing drawings.
I'm ready to discuss details by messaging before starting, contact me if interested.
Best regards
Anatolii