I think so. One can change a GSA/POR to "improve" a given class without a re-vote, etc, etc.
But given that commons didn't get to "vote" and were "deemed to reject", and the fact that such a revised GSA/POR would be so substantially different...
I think it goes past the "an improved change to classes" category.
And, also, if a given class is going to be 'more impaired' then it definitely requires a new DS/Vote, etc -- but, if that class is only the SNH's, then perhaps they could waive that.
But, honestly, I expect another round of DS/Vote etc.