Long bar ends as drop-downs?
Yes - this is a known way to get stubby aerobars on a flatbar MTB, that don't stick out too far but provide some benefits of an aero position.
Downside is that you generally can't have brake levers, so your hands are a long  way from the brakes. This is definitely not for urban riding of any sort.
Likewise, you're further from the gear shifters.  Okay if you settle into a gear and stay there for a while, but not good in undulating roads.
Lastly remember that since your hands are closer together, there's less fine-control.  So to start with it will feel very squirrely, and crosswinds can have a much larger effect before you can recover.  Over-compensating is possible too.
Upshot: this is great if you have a long open road in your commute on a MTB, or if you have a gravel fire trail/track.

Normally these &quot;Bar Mids&quot; (instead of Bar Ends) would be attached to the bar inboard of your grips, brakes, and shifters.  So all that has to come off the bars first.
If you do races on this bike, remember that many disallow the use of bar ends, so bar mids might be disallowed in the event.