I don't think they have any cards left, unless the lead hounder wishes to attempt to recapture me and force me to live with them. They could "mark" me as a bad associate. They could disfellowship or disassociate me. All that would do is cut me off from even worse associations. And it would cut me loose (even a disassociation letter is no guarantee: those could get misrouted or mishandled at Crooklyn and not take effect). And cutting me off from "social activities" would be useless since there are no more of those.
The only thing left would be for one of the hounders to attempt to recapture me and force me to live with them. If they did that, they would have to take the chances of getting a nice 50 year jail sentence for kidnapping, plus I would do all I could to ruin their faith, putting apostate material and porn on their computers (if they had one), buying apostate literature, and ruining every call I have the chance to. If they play that card, I will make things as miserable for them as I can (assuming they are going to stay active as Witlesses). Aside from that, I don't think there is anything they can do (legal or illegal) to crack down on my fading.
And they had better not try to haul me if for a judicial hearing, unless they want to waste the time and gas to get there only to have me not show up. I have nothing to lose if they disfellowship me behind my back except a bunch of losers. Not to mention, if they drag me into the hearing, a few well-chosen swear words and The Finger would probably cut it short, with the effect of getting those losers off my back.