It's a tricky one. Elders, CO's and service desks have an aversion to this scenario, understandably.
The signing of the papers seals the marriage. There is no way around that. As far as then breaking it for non-con, I have seen situations where the elders breath a sigh of relief if the "performing" spouse just gets it over with with someone else. They may or may not be DF'ed depending on how big of a performance they put on in the JC. A performance is good because then the "annulment" can take place without anyone getting DF'ed. Everyone's a winner! The elders end up feeling justified in doing what they "naturally feel is right" even though the Bible doesn't really make allowance for it in relation to 21st century law.