i have created a little Hex patching utility, to help keeping all patches together and make easier the patching thingy.
How it works:
If you need to patch a kext, move it to your desktop (the app will not patch and save a kext if it´s in S/L/Extensions folder).
Navigate inside the kext into contents/MacOs
Drag the Binary you will find there into the app.
Add the codes to be patched and the patches to the app.
Patch the binary.
Save the binary (the app will do a backup from the binary prior to patching).
Install the kext with your favourite kext installer.
You can save and edit the patches sets using the upper part of the app, so they can be stored and retrieved later.
PD: it can patch whatever Mac Osx Binary.