Hack to enable invitations for Trust level 1 users

I want the process of gaining trust level 2 to happen naturally with users participating and gaining the level. My only requirement is they be able to invite others to their current topics and the forum in general without the need to wait until they finish reading 100 posts or all that listed above. I understand it is not unreasonably high but in my case, I also feel the time this would require is going to cost me user interest as well as new members. I am guesstimating out of 100 users at trust level 1, only 10 or so are going to stick around long enough to gain trust level 2. The others are going to just drop off. But before that, I would be interested if they can help invite a couple or so users themselves out of which a few may help build my community by participating well. And so on…

If there’s something I can do now to get my users at trust level 1 to use the invite feature without having to promote them to level 2 myself, let me know.