Anyone ever attempted to do a locker on the diff

I am considering trying to fab a locker on the diff of my 09’ GEM E4. They are worthless in the sand or if it is slick so an air locker would be awesome. Not interested in welding the diff since I drive it on the street allot. I want to be able to take it to the beach occasionally and right now that out of the question. soft sand equals pushing…

Has anyone tried this? Does anyone have a 09 diff they would sell cheap in case i pooch mine?