From what I have seen tdehwdevicetray just starts the hwmanager. So that functionality should be integrated into that, or I am wrong here? So that should also work if you don’t have installed tdehwdevicetray or neither it even running. From the TCC (hwmanager), for example.
See in device manager --> Configure hardware --> Disk --> click on a LUKS disk --> LUKS tab.
The same module is also available in TCC.
By the way device manager is a core part in tdebase, it is installed with tdebase, AFAICR
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