Overall shouldn't it be the will of the English voters? Either way Revoke Article 50, stay and just tell the English that they're better off and they should know better.
Breaking up the UK over Brexit seems like a bad idea IMO.
If you think Brexit is bad, Scotland-exit would be a million times worse (though at least the SNP had a detailed plan during indyref, while the Vote Leave people didn't)
Northern Ireland leaving and joining regular Ireland would also be harder than Brexit, but not as much as Scotland leaving the UK, the best parallel would be German reunification except Northern Ireland is a lot more developed than East Germany.