Think we could silk touch one of them off the pillar or something?
Considering they explode when touched, I don't think that's possible.
On topic, I once found the End Portal, then proceeded to stupidly stare into it contemplating whether I should go or not, 5 seconds later I decided against it only to be pushed in by a silverfish. So there I was in the middle of The End with only a nano helmet, an electric jetpack, nano leggings, nano boots, and a nano saber, in other words, absolutely no ranged weapons, I found my strategy to be pretty effective. First, take out all beacon things that recharge the dragon's health (if you're going to leave a few for GregTech power, good luck with that), second, always look up to the sky, and in the event of Enderman attack, just jetpack onto the obsidian pillars, next, head to the center of The End main platform, finally wait for him to charge at you, and turn on the saber, while dodging with the jetpack if you can, a few moments before to properly hit him with the saber several times in a row, repeat until he dies. Through that method you can't be knocked off into the void, it might be close several times, but I ultimately killed him in only one attempt using this way.