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With my kids I repeat the error in a questioning way, for example,

He live in China

I say:

He live?

And they then provide the correct answer.

That is quite intrusive and the smile and wave thing is or course far better if you are doing a fluency type of activity.

I actually think that the warm aubergine idea is excellent and am surprised when you say it didn't work. It's just the kind of pattern interrupt that would make something new stick.

You could dedicate a lesson to doing a fluency type of activity with the one exception that this particular error will not be allowed. Every time someone makes the error you throw a warm aubergine at them, or squeeze a ball that makes a sound, or they have to stand up clap their hands turn round and sit down again - so that they really really start thinking about getting that S on the end of their verbs.

Sure sounds like a lot of fun trying anyway!

PS Seriously, what teacher has time to take warm aubergines into English class?