Chris Messineo wrote:But, is there an official (or somewhat official) LUT that just gives a nice clean look with pure blacks and whites?
In my experience, unless you're carefully monitoring with a custom LUT on set during your shoot (and in best case you have a DIT on hand to feedback), then any LUT you use in post is just going to be a rough starting point for your grade. There's no magic bullet here.
That said, there's a few custom LUT offered for free from Captain Hook amongst others which may be useful to add to your collection.