The codes you have listed are actually in two notations. The numbers after the slash, starting with 5000 is the short form of Pronto hex code for same code listed in front, starting with RC5. For example for EXT1 (YUV), 5000 means RC5 protcol, 0003 (second from the end) is the device number (3), and 0004 (the last number) is the function number (4).

To generate the long form with the info that you have, in the irp file, change the "Device=" entry to the number after RC5 and leave the "Function=" entry to "0..127" (it means generate all the codes for functions 0 to 127). After Makehex generates the .hex file, open it up in a text editor and go down generated code to find the function number, and the long form is the series of codes below that. For the example above you will see the entry:

Device Code: 3 Function: 4
0000 0073 0000 000B 0020 0020 0040 0020 0020 0020 0020 0020 0020 0040 0020 0020 0040 0020 0020 0020 0020 0040 0040 0020 0020 0CC5

The code you need starts from the second line.

Since you have some codes with device=0, you will have to run Makehex again with "Device=0" in the irp and find those set of codes.

I'm not familar with URC remotes, but I think you can use the universal browser to import the hex codes, or for some, you need to make a ccf file with the hex codes to import using the universal browser. I think you need utilities like IRPanel or Hex2CCF to do that. You can find them here.