How to use a kext that has just the info.plist changed without codesign or SIP disabled?
If you have no problem in keeping SIP half-enabled like you mentioned, then you can proceed, but with caution. Unless you are really sure that this Info.plist change will work as expected, do the following:


Copy the modified kext into System/Library/Extensions after authenticating
Execute sudo chown -R root:wheel /sample_path_to_kext
Execute sudo chmod 644 /sample_path_to_kext
Execute sudo kextcache -i /
Restart


Alternatively you may use an app like Kext Wizard or Kext Drop and just perform sudo kextcache -i / at the end of their operation.

Lastly, I cannot stress enough how dangerous this is to your Mac. Please proceed only if you really know (or don't care) if something unexpected happens.