I"m not suggesting that this change won"t be a pain to some people, but it is useful to put it into some context.
If you were to still turn up at 4:30, then you would miss the first two levels. You will have roughly lost about 600 chips through the blinds putting you on 9400, and average chipstack will be about 10,400.
Obviously, you will have missed out on a couple of levels of information and play at the table, but you would not be at any significant disadvantage chipwise.
If you were planning on turning up two levels in anyway (at 6pm), then I guess this does kind of ruin your plans.
Again, just my opinions, and players are completely entitled to shout if it"s a problem.