My Passet has the key in pocket feature but as said it reads a lot of things before starting the car.
One touch with key in pocket unlocks the doors.
IF you can find an aftermarket kit you would be better off but I have never heard of one.
Another thing, although Ford owns a lot of Mazda and there are similar models, Mazda only products have a lot of differences from Ford. So first you need a Ford product made by Mazda, then there has to be a similar Ford product, then you need to compare every wire hookup and sensor in the auto-start system. Now all you need to do is hook up all of the sensors and computer interfaces and there you have it...
Finding an after market system for a Ranger, even that isn't easy anymore.
Luck on your project, post if you find something, this might be something some of the other Ranger owner are thinking on too !
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter