Yep, z>pagedownx2>downx4 gets you right on bars. The only annoying thing about it is you have to pass over stones, which usually makes the game hang a second cuz there are usually about 8293423847234 of them.
I have long since gotten used to page-downing and page-upping 'past' the stones, in order to approach the near-stones items in several single steps from the other side and avoid said
(edit: somehow truncated this para, reinstating) pause, or if I intrinsically know how many downs I would go, do that on the initial screen, before the page ups/downs.
I
did start planning a Stockpile Therapist back in 40d times, based on the DFHack tools, but I don't think I got anywhere near getting it in any implementable form.
The idea for the Stockpile Therapist was to identify all stockpiles and match against all customisable categorisations (which have changed at least twice since I did that, especially where it comes to stone blocks) to both have a list of stockpiles and how full they are and (if I could get it) a list of all items
not stockpiled, and also to see the sub-categorisations with numbers for free/used relevant to that and the number of 'free' objects that likewise match. And thus (by in the main two ways one might want to do so) you could see both unhandled over-abundances and low-stock conditions.
Big project, and vague in parts for all that. No wonder I didn't get very far.