In a JW's mind any kind of protest or disruption like this = persecution
persecution= confirmation that the end is near, they are God's chosen people etc...etc...
So all you do is reinforce their beliefs.
I think if you want to do anything show up early tell everyone how glad you are to see them. Observe the memorial and then start talking about how happy you are now that you are a born again Chrisitian or whatever you are now, and invite them to go celeberate Easter or whatever with you this Sunday. I am sure you'll get treated like a leper but the first few you catch off guard will be great. Pick your first targets well, show them how happy and ok you are with things. When they ask you to leave just say ok, smile and say see yall next year!