Im currently rebuilding my hubs, swivels etc. i have tried searching but cant find the info im after (maybe wrong words being used

Anyway im wanting to know if i can replace the power locking rings with normal nut set up? im running factory hubs that are now manual engagement.
the annoying issue is every time i have to undo the t20 screws i snap my t20 bits trying to undo them - even when they are set at right torque.


If it isnt possible to add the second nut then is there an alternative solution instead of t20 screws others have used?
Second issue:
Ive brought a terrain tamer rebuild kit and it didnt include the outter seal (circled in red in following pic). i know the tt kits suit the aussie trucks. is this still needed as im not running the electric engagement side now as, as far as i can tell its only need for that?
Cheers john