use the styleid of the referrer maybe in their incoming links for starters maybe. Of course styles have to be selectable and that means if one is nice, people are gonna switch.
You can add a variable to the links at the referrer sites and process it in a hook too. Passing the style and referrer is easy. It's your post processing that is gonna be key.
Assuming they are gonna have to register the first time, you can grab the referrer var and process in register.php hooks to put them in a group.
I'm thinking out loud. I hope it sounds as good on paper.
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