IMO, you should at first place try to bring your 3 port USB hub to life, in order to charge Librem 5 when connected to some monitor. See on how (approach-wise) here:
Actually this one: https://www.artwizz.com/en/smartphone-accessories/technics/powerplug-usb-c-15w_28421_15850/ is slightly more advanced option to provide enough power to your Librem 5 over Delock 64062.
Short answer and only one would be: don’t even consider to buy it (if not USB-IF USB4® certified/compatible).
In order to have M14 (without touchscreen) monitor working you would need either Club 3D CAC-1332, CAC-1336 or latest CAC-1504. Actually just asking for your opinion on those or such adapters (those need 5V/1A, for integrated micro USB port there, from some external power source), general opinion. Do you “see” them working with M14 monitor?