Making A Specific Link for Trust Level 0

I feel like I saw this somewhere but can I make a link where if I send the link to a trial customer and they sign up they’re automatically put in a group and pending for approval?

Ideally, if I could have a link for when they sign up they get a trust level of 0 then I would know that they are a trial customer instead of a converted customer with a trust level of 1. I have my default set to trust level 1 for paying customers but would like to get pending users to default to trust level 0 if they’re from a trial funnel vs level 1 from a paying account level.

I hope this makes sense. Thank you!

I think you should be setting trust levels based on groups rather than a global default for all new users.