#30 is mostly Batman with a little Renee/Batwoman stuff in the middle and Nightwing/Batwoman at the end; it's the Batman Thogal ritual stuff that's important
#47 it's the first two pages and the last two pages only
Speaking of 52, if you wanted, you could keep the end of #30 with Nightwing and Batwoman meeting and include the first few pages from #33 where the two of them exchange gifts, as it does get briefly referenced during the Batman & Robin arc with Batwoman (specifically #8.)
I don't have the floppies with me to recall what non-Batman materials shares pages with the Batman stuff, so can't say what you can remove (unless you're smyth sewing, then I doubt much can be removed from #30, but #47 you might be able to remove all the middle content without having to tear anything.)
But if you have the time, I always recommend reading your proposed order to make sure it works and you like it, of course. With binding you can do things any way you want, so while there may be a "correct" reading order, it's your own personal bind, you can do whatever you like. And certainly when it comes to Batman there are lots of options and no one definitive right way to do anything. Lots of folks like to include Whatever Happened... others throw in Battle for the Cowl. If I did it, I would stick strictly to Morrison's material only. That's part of the fun