You could just invent your own system, use the standard 4-pin connector that is used by EMG and have that wired up to the pickup slot, readily connected with whatever configuration your guitar uses.
Then whenever you get new PUps, just wire them to one of those connectors and you can swap around as you like in minutes.
Actually seriously consider doing this. The only drawback is that you'll cut all your pickup cables short, which is bad if you'd wanna sell them, but hey, just always buy BKPs, so selling is no seriously considered option anyway :)