while trying to suppress Caps_Lock's function I am stuck with assigning a
modified keytable/-map to console sessions on boot

To accomplish this I

- set 
KBD_DISABLE_CAPS_LOCK="yes"

in /etc/sysconfig/keyboard

- replaced all occurances of "CtrlL_Lock" with "Shift" in the "^keycode  58"
line of the 'de-nodeadkeys' map and saved it as 'de-nodeadkeys-nocl.map',

- gziped this file,

- ran 'localectl set-keymap de-nodeadkeys-nocl'
  which modified /etc/vconsole.conf accordingly as well as
/etc/X11/xorg.conf.d/00-keyboard.conf

thomas-nbk:~ # cat /etc/vconsole.conf 
KEYMAP=de-nodeadkeys-nocl

thomas-nbk:~ # cat /etc/X11/xorg.conf.d/00-keyboard.conf 
Section "InputClass"
        Identifier "system-keyboard"
        MatchIsKeyboard "on"
        Option "XkbLayout" "de"
        Option "XkbModel" "microsoftpro"
        Option "XkbVariant" "nodeadkeys"
        Option "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection


- 'localectl' now shows
  System Locale: LC_CTYPE=de_DE.UTF-8
      VC Keymap: de-nodeadkeys-nocl
     X11 Layout: de
      X11 Model: pc105
    X11 Variant: nodeadkeys
    X11 Options: terminate:ctrl_alt_bksp,ctrl:nocaps

and in text consoles Caps_Lock no longer interferes, fine.

But after a reboot 'localectl' still shows everything as before, but

thomas-nbk:~ # dumpkeys | grep "^keycode  58"
keycode  58 = CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock  CtrlL_Lock 
CtrlL_Lock  CtrlL_Lock  CtrlL_Lock      

so the keymap is _NOT_ loaded!

If I do a 
thomas-nbk:~ # loadkeys de-nodeadkeys-nocl

the (modified) keymap is finally loaded and Caps_Lock so no longer an issue
(until next reboot)

thomas-nbk:~ # dumpkeys | grep "^keycode  58"
keycode  58 = Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift 
Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift  Shift      


adding
KEYTABLE="de-nodeadkeys-nocl"

to /etc/sysconfig/keyboard made no difference. Modifying the original
(de-nodeadkeys.map) also changed nothing in the behaviour.