Nay for the record.
This was one of the most...'odd' constitutional bills put before the Senate. The text of the bill has changed a few times and none has addressed what is to be gained by having 5 regional seats not only elected differently (which can be argued) but also with a difference in qualification
The qualifications and means of election for Class A seats in the Senate may be changed by the Regions to whom they belong.
There is nothing to stop regions setting a ludicrously high, discriminatory or undemocratic bar on qualification. I am not assuming that any regions will...but theres nothing to stop them doing so.
Along this line, the Pacific or Southeast could easily have the votes to set a party requirement for their regional senators.