Save selected Mail attachment to specific folder

I receive a lot of emails with different attachments. Most of the time, I only need one attachment to be stored in a specific folder (and it never changes). I want to select the proper attachment and then use a keyboard trigger to automatically save that single attachment to the defined folder and archive the email.

If done manually, I'd use the context menu on the attachment, but I cannot open it automatically in KM.

Is that even possible or too much for KM?