uh well other then say the paintbrush(also known as Americana from the mount) there arent to many submission's that require the guy pinning to keep his grip on one of the arms..

that in mind you could always shrimp and bridge then proceed to free your arms ad-mist all the bumping.

OR you could attempt to straighten your arms(or not) and reverse shrimp out the back door,..so to speak-you did say it was a high mount yes?