BRHMKY,
Delaying or knocking back a position at AJX to get a few hundred hours command where you are will not really achieve anything. If you have decided that AJX is what you want then as soon as you get your 3000hrs go for it. In my opinion ANA will not care about 500hrs command on the 737 or A320 and it will only delay your spot at AJX, if that's what you really want.
Sorry I don't have a briefing package.