You could do scales on the out side that is two stunt groups the two scales grab the libs arms then a lib in the middle with a shoulder sit in front of the lib so the lib can hitch.
Just make sure that it's okay for your group to have an (extended) lib brace what is essentially 2 other (extended) lib variations. I know that Jandotcom is doing rec league and NFHS may not apply to her but for JH/HS NFHS schools only elevator extensions can brace other elevator extensions. Libs/lib variations can't brace each other unless the bracing stunt is done at or below should height.
Thanks for the info, but this would be over our heads anyway, I think.
And, interestingly, our association has developed its own set of rules, which are severely lacking. It says that at our level we can do one-legged extended stunts, but only a lib, arabesque or heel stretch. We are not allowed to do a scorpian at all (and the wording suggests that we couldn't even do it on the floor!) It doesn't address scales at all, neither as a "can" or a "can't". It also doesn't address the concept of bracing - it doesn't allow for more difficult stunts if they are braced.
This is just one example of how our rules are lacking. Fortunately, though, I got myself invited to a rules meeting, which will include our local AACCA certifier, so hopefully there will be some improvement!
Thanks, everyone, for the ideas!