I know you've previously declined to implement blizzard style bag-sorting. That's fine. There's a library, "SortBags" that enables this functionality.

SortBags() will sort bags when installed.
SortBankBags() will sort the bank when installed and the bank is open.

It also supports per-bag sorting and exclusion, as well as Right-to-left and Left-to-right sorting - but all of that can be configured using the command line switches for the SortBags library itself.

If I have time I'll create a PR with the buttons added to both inventory windows. You've provided handy state functions for cached or not cached inventory which makes it easy to NOT show the button if it won't do anything.