Sandbox Mode (Similar to BD)

Ever since the removal of BD (we may not be getting it back :c), it has indeed caused some troubles for me. In the past (1.5years ago) I would usually load up a BD match to warm up, get used to the headshot hitboxes etc.Could we have some kind of sandbox mode/training mode that gives no reward but is similar to BD? Say like having target dummies or moving targets for aim and what not. The practice mode just isnt useful at all.