I don't see a situation where PH has some influence over this process and they don't give Selangor what it is owed.
I do, and it's very simple. East Malaysia will get to 35% this time – there is the political will to give them what they want. Giving any seats to anyone that isn't EM will make that more difficult, just purely as a matter of arithmetic.
There is no political will to give more than one player what they want, especially if it involves expanding the House by sixty or more seats. East Malaysia trumps PH because East Malaysia might abandon Anwar, and PH never will.
I know that expanding the parliament size is almost always unpopular with the public but doesn't benefits of expansion for PH outweigh any decrease in their supports?
Honestly give East Malaysia 40% of their seats in exchange for less urban-rural malapportionment in West Malaysia.