One thing you could do after inviting people, is set up an alternate account, send yourself an invite, join with that account and then get back to your GM account and kick yourself from the campaign. This will change the join link for the campaign, but anyone who has already joined will still have your campaign in the "campaigns Joined" part of their profile. A little laborious, but workable. I have a second account I use for testing what players see in my campaigns (in a different browser, so dont have to worry about logging in and out). This method is easy and quick once you already have a second account set up.
