Since every node (hence each pool) has its own mempool, you cannot ensure a node has received or not a transaction.
This being said, the government nodes wanting to censor a transaction can simply not tell / sign that they've received it.
Nobody stops them from doing that and eluding your system, yet still working in the same way they do now.

So I see your system only something that gives more to do to honest (ie playing by the common rules) polls while the dishonest (in this case censoring) ones are favored.
Am I missing something?