I have updated my original post to say "sell menu" rather than "buy menu".
It occurred to me that this issue should be pretty easy for someone to code up because the interface you need is already there -- "Your equipment list", aka, the sell menu.
In fact, that menu could get double-use. At the bottom, in addition to the "sell equipment" button, you could steal from the existing transfer menu to have "Send to [drop down list]".
Really I bet it's less than 30 minutes of work since the "Your equipment list" is already there and is most of what we need.