Raven, I assume that you do not want to be disfellowshiped otherwise, you wouldn't have tried to fade out. And I also assume that you are not intending to go back. Hence, I would seriously consider the idea of simply lying to them. Its much easier than you may think. And considering that these man are presently in hot pursuit of you for the sole purpose of taking your family away from you, I believe it is 100% justified.
If you tell them that you are married, they may go back to your mom and ask her. If she tells the truth, you can tell them that you hadn't told her since you felt bad about not inviting her and the fact you got married on a spur of the moment.
Than, anyone who meets you in the street will think that you are with your husband even if you left your current boyfriend and find another! And if they talk about you not living with him any more? Well, you're separated. And if they do realize you`re not with the same man? Well, the bastard cheated on you and you remarried!!
Much much more easier than the "letter from my lawyer" route. Once again, people who want to take you away from your own family deserve no respect at all.