Force internal speakers

Hey there,
The pin of my speakers broke inside of my Audio Jack. My warranty has expired and I am not able to get the pin out.
I would like some help on this matter.
So, I tried forcing my mac to revert all sound through the internal speakers. Since there's no software out there that will do this, I'm a bit on my own here.
I changed the preference files in library/preferences/audio
com.apple.audio.SystemSettings.plist
This is what I changed it to. I'm assuming 1B,0,1,2:0 is the code corresponding with my internal speakers.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
          <key>0</key>
          <dict>
                    <key>current default output device</key>
                    <string>AppleHDAEngineOutput:1B,0,1,2:0</string>
          </dict>
          <key>501</key>
          <dict>
                    <key>current default input device</key>
                    <string>AppleHDAEngineInput:1B,0,1,2:0</string>
                    <key>current default output device</key>
                    <string>AppleHDAEngineOutput:1B,0,1,2:0</string>
                    <key>current default system output device</key>
                    <string>AppleHDAEngineOutput:1B,0,1,2:0</string>
                    <key>primary default output device</key>
                    <string>AppleHDAEngineOutput:1B,0,1,2:0</string>
                    <key>secondary default output device</key>
                    <string>AppleHDAEngineOutput:1B,0,1,2:0</string>
          </dict>
          <key>version</key>
          <integer>1</integer>
</dict>
</plist>
I also made sure that _coreaudiod is added in the user permissions, through terminal. I gave it a READ ONLY status for coreaudiod, because I don't want it to change on reboot.
Ofcourse I'm not sure wether 1B,0,1,2:0 is actually the right code for my internal speakers. There's no way to test this, other than trial and error. Ofcourse I'm not going to trial&error for hours over this issue.
I rebooted (duh).
Now when I go to preferences it still says for Digital Out - Optical Digital-Out Port
How is this possible, since I have manually overridden it?
Also, please do not respond with:
- Go to apple store & get the pin out
- Get an USB headphone
- Get a new logic board
-> I know these will get the problem fixed, but since my warranty is over I'm not persuading these options.
Basically, I also would be thrilled to be able to solve this using my method. There are other people out there (I googled this thing for hours), who might be helped with a fix.

+I need to enforce the use of headphones.+
I think that's your answer. Headphones always connected to each iMac. Teacher enforcement. If need be, you could even epoxy the jack on the back of each iMac so the headphone jacks can't be removed.

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