NOTE: This will not fit with the standard bed handle. I use a simple ring pull fitted to the bed roller axle.

This is a simple push fit over the Y- axis belt tensioner bracket; allows access to the adjustment knob and the drawer.
It does overhang the build plate by around 20mm due to space limitations in my enclosure but could be simply amended not to do so.
Enclosed are two .stls- the original design (pictured) and one with a wider top plate and arm.
(Note that I changed the design slightly from the photo to ensure clearance on the drawer but I couldn't be bothered to reprint).