I would say the best way of installing a keyless entry would be getting all the auto locks and then wire the keyless entry into one of those. I was reading an article of a guy who installed the keyless entry switch into the trunk autolock and it worked great.
As an auto sound and security installer I've done tons. Its more time consuming than it is difficult, on four doors it takes about 45min to an hour and a half depending on the kit and the car. Spal makes a great kit and the switches look like factory BMW switches. You might try a auto sound and security dealer if you arent confident doing it your self. They may charge up to $300 for the conversion.
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