When enough questions are in the edit queue, there is a little orange button next to the review link with the # of questions in the queue (at least, I think that's the case.... I'm not that familiar with the internal workings of SE and its not active now so I can't verify this)

I spent a lot of time not knowing what that was, or thinking it was something I shouldn't touch, but perhaps you can add a tooltip to that button for users who are active on SO, but not on meta, that says something like "Help! Our edit queue needs the attention of high-rep users like you!"

Should be fairly simple to implement, and would have a similar effect as creating something on meta (except the people seeing it are high-rep users who browse SO, not MSO users, which I think is better)

...

and perhaps change the orange square to a bat icon too for the sake of bat-lovers everywhere? :)

When enough questions are in the edit queue, there is a little orange button next to the review link with the # of questions in the queue (at least, I think that's the case.... I'm not that familiar with the internal workings of SE and its not active now so I can't verify this)

I spent a lot of time not knowing what that was, or thinking it was something I shouldn't touch, but perhaps you can add a tooltip to that button for users who are active on SO, but not on meta, that says something like "Help! Our edit queue needs the attention of high-rep users like you!"

Should be fairly simple to implement, and would have a similar effect as creating something on meta (except the people seeing it are high-rep users who browse SO, not MSO users, which I think is better)

...

and perhaps change the orange square to a bat icon too for the sake of bat-lovers everywhere? :)