If its just the 4P4C modular plug on the very short tail (~ 3") then you should be able to replace that? Cable is short but there should be enough cable if you cut off right up hard against the plug? Otherwise you may be able to crush the connector with side cutters and break it out/off?
The modular plugs are easily obtainable, just require a crimping tool to install. As mentioned the plug is a 4P4C