If your bars are slipping, I would be very very circumspect about any workaround. If your bars really loosen up while on the road, you will have a really nasty accident. It will be sudden and unpleasant.
I haven't read all the posts on this topic. I see something about the sleeve being the problem. I would not trust any glue other than a carefully applied epoxy, and there is no way I can think of to get that in there. I'd hang those bars on a nail. Find something else to use.
3TTT made a really nice upright bar (I think that's what you have here). Of course, these would be 26.0--the Cinellis are probably 26.4, right? Also, they're out of print and hard to find.