Hi Julien,
The invites are processed through plugin "Pavliks.PortalConnector.Plugins.PostPortalInvite" and cannot be changed. Because, changing the plugin will require a change in the widget too which is an out of the box widget. However, you can contact our support team at
support@crmportalconnector.com to discuss the possibility of any custom widget development to get the desired business logic in place to your specific requirements please.
Thanks
Syed