lol, I tried adhesives, but the problem is that the vent doesn't make contact with the dash when the clips are broken. You can't get it to seal because those clips are just floating in those gaps, and the actual trim doesn't touch the dash either. So this never worked.
Duct tape thickened these clips on the vent trim enough so that they would actually hold it in place in the openings they were to pass through. You can't see it at all, and the vent trim stays in place like new. Also, if you still wanted to pop it out again, it would be a whole lot easier to do than if you used epoxy.