Steve,
I have used this method for over twenty years. and it works a treat. I made my own, simply by epoxy glueing eight plastic rawlplugs to the bottom of a standard 10 x8 tray. Everything takes place in one tray. I place four 5 x4 sheets of film in the dry tray, pour the developer in and agitate gently and continuously for the required time, then pour out the developer. The film doesn't fall out of the tray even when the tray is vertical . It sticks to the bottom. After stop bath and fix I even wash the film in the same tray.
So, minimal handling and no film damage, even with Efke.
Alan Clark