Your legal counsel would be the best to advice on that. If it is possible, it would be interesting to see how Nominet would view the sending of a legal letter to a complainant by a defendant stating that they view their actions as being without grounds and malicious and that they intend to bring a civil suit against. Could it be construed as intimidation?
I want to recoup my legal bills against complainants that do not pay for an Expert decision. The barrier to bring complaints are very weak. IMO all complaints lodged should be with legal counsel. The half baked complaints I see have no abusive element to them.