Paid Subscription Tweak

[Cyn]

We currently offer business advertising in signatures for a fee to our members. I would like to set this up as a paid subscription and I know how to do that. But here's the additional need that doesn't seem possible with the current features available.

I want those who have this paid subscription to be moved, upon expiration of the subscription, to another usergroup that has the signature feature disabled so that they lose their signature and must either pay to renew their subscription to get it back or contact me to be manually moved back to the registered user group that has signatures enabled.

My setup for the business signature advertising subscription places the paying member into the secondary usergroup - Business Signature Advertiser - while maintaining the primary usergroup status of Registered Member. The Registered Member group has signatures enabled.

I've studied the promotions setup and can't see a way to make it happen through that.

Thanks!!