You can't make a keypad do that. It's not permitted to show any detail to a level 1 user ie non permitted user. That's why it beeps etc till a level 2 user proves presence, code or fob. Regulation issue
assuming as you say 0abcd then its not on default codes. But I only know the uk panels and they may have different defaults. I think they are printed on the pcb in the aerial area.
if the code was correct it wouldn't wait for any more digits
why not use a hdmi to dvb modulator. A decent hdmi extender will work but im struggling to find a v2.1 on at 15m for my own house or even a 2.1 cable
I have heard of some success using fire sticks and the recorder android apps but never tried it. I use mythtv and zm fed from a sw ahd dvr over rtsp
On hkc you can't access engineers without user authorisation everytime via the keypad.
The bells thing is non compliant and an issue I have if you use the default bells only option. Engineer access needs authority regardless of proper comms etc
I know this won't go down well, but if anyone buys from someone that is too cheap they probably won't be able to afford to be around for long. I'd suggest you find a company that has been around for more than 5 years