The patch will work, I think. You need to flash R1BC002 to your phone and then apply the patch. But if you flash your phone after you patched it, it will be locked again and you've got to repeat the process.
You can get the NCK code with SEMC Tool 8.4 (you'll need a service cable). Choose "read all codes". Make sure that you have a firmware version installed on your phone that is supported by SEMC8.4.