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1. Increase maximum block size weight to the point where Chinese pool's connection can't keep up, but this is difficult since block propagation already use Compact Block
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This runs both ways though. With the majority hashrate presumably being located in China it may very well be that using increased block weight as a weapon would merely lead to an increased orphan rate in Europe and the Americas, further strengthening China's position.
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Currently we have a sort of mutually assured destruction situation. If there's a preemptive PoW change, then that'll make a huge, not-worthwhile mess (though survivable). But if miners do an attack, then there will be an immediate PoW change, firing them and at least forcing them to start over from scratch hardware-wise. [...]
Is there any agreement on how such a PoW change would be implemented and what code of conduct would be followed? For example how a new PoW scheme would be selected. I presume some thoughts has already been put into it, beyond merely considering the option.