Hello and welcome to the Forum.
You have done a lot of research and that is great and I commend you for the extra efforts.
Based upon what you have typed you have tried a lot of things so at that this point might I suggest you do a factory default of the system and start over. It is just best to start with a clean slate.
Enter the following and the panel will be defaulted back to factory settings.
* 8 code 0 # 9 1 0 # exit exit
Now that only defaulted the main board not the keypad.
Now you say that you addressed the keypad as 192. Let's verify that but doing the following.
* 9 4 9 7 1 3 1 * 1 * then * 8 9 7 1 3 0 # exit exit
Now default the keypad.
* 8 9 7 1 3 1 9 2 # 9 1 0 # exit exit
With the NX6 or the NX8 you do not need to give the panel a starting zone for the wireless receiver. So don't concern yourself with it.
Next you want to learn in your wireless devices. It is easier to set Auto Advance on the keypad. Press the following to set Auto Advance.
* 8 9 7 1 3 1 9 2 # 5 9 3 # 2 * exit exit
Since you have a NX6 and a NX148E-RF keypad you can start at Zone 7 with the first zone.
I will stop here and wait for you to respond and I know that you are good up to the point.
Come back and tell me how you are doing.