Kziidt metal and some leather devices can be unlocked by "Fetish device key". But now only way to get this key is craft it at chemistry workbench. Can you add "fetish device key" as droppable key from loot and make this key destroyed after device unlock ?
About constantly disapearring diapers. For me mod "Commonweath moisturizer" by default uses slot #51 that conflicts with diapers which uses slot #51 too. "Commonweath moisturizer" allows to change slot in its settings in MCM.