What about a remote start?
And as far as the proximity bit I'd look for a kit that didn't mess with the ignition lock cylinder. Might have to be a one off build..
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'13 5.0 in deep impact blue, "The Blue Goose"
A few mods, just a daily.
94 F150 302
New project, thinking built, procharger, powerglide, tubbed, super sleeper 
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