Well, you certainly couldn't link from it directly from camsite or models explicit twitter account then I guess.
However I don't think that excludes everyone. For example, if the model is not explicit on Twitter; If the model has a non-explicit blog. Another, which would probably be the easiest to manage and incentivize, would be an email list specifically for this.
Free wordpress blog account;
free mailchimp account;
welcome email with affiliate link in it
weekly blog / email update with progress towards a goal and to continue getting affiliate link out there with every message
incentivize participation in whatever way you choose.
30 minutes worth of work for something that could end up turning freeloaders or low tipping members into revenue, seems like a worth while test to me I guess.