It shouldnt be an issue. Sensored has a smoother start up so for certain things, like crawling or racing for example, its much more important to have very smooth and controlled torque at start up. Sensorless is more efficient however and most (if not all) sensored ESCs switch to a sensorless...
Those Rocket 4274 motors are good up to 2800W, up to 50k RPM, so if you max out your gearing then just up the voltage. You could also just choose a little higher Kv motor if your have to run it on 3S. My concern here is that your talking about building a 100+MPH tethered car with 1/8scale...