Promotion without a base usergroup?
 

My members have many different primary usergroups. Because of this, it makes promotions a bear to setup.

Is there any way to not base a promotion on a usergroup, but just add a user to a usergroup after they reach the promotion threshold?

Example: I want all users that joined over 30 days ago to have the "Update Users" group added as an additional usergroup.

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Right now (if I understand this corectly). I cannot do this for all of my users. I would need to set up individual promotions for each usergroup that members may have as their primary usergroup.

For instance, my list of primary usergroups looks like this (shortened):

Registered Users: 30K
Upraded Users I: 2K
Upgraded Users II: 1.5K

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Do I need to setup three seperate promotions to add them to an Additional Usergroup?