So I thought this solution might work and was going to post it, but I kept getting a BSOD if I leave the driver installed. Maybe you'll have better luck if you want to try fiddle with it. Take it or leave it:
Basically I created 2 tasks in Computer Management. One installs the sound driver on boot. The second deletes the sound driver from c:/system32/drivers 3 minutes later. It seems to hang on shutdown, but that's not too much of a problem - just hold the power button.
Note: You will need to download the sound driver installer through the SW Update utility.
1: Put the driver files somewhere you'll remember. This should include the Setup.exe and all necessary install files. You will also need to create a .bat file with the following contents: "move c:\windows\system32\drivers\rtii2sac.sys" without the quotes.
2: Right Click on Computer, then click Manage to open Computer Management
3: Open Task Scheduler and Create a New Task
4: On the General tab, name it something like "Sound Driver Install" and select "Run with highest privileges"
5: Open the Triggers tab and click New. From the drop-down menu select "At log on". Select "Stop the task if it runs longer than" and set it to 5 minutes. Click OK.
6: Open the Actions tab and click New. Click Browse and locate the Setup.exe for the sound driver installer. Click OK.
7: Open the Conditions tab and uncheck "Start the task only if the computer is on AC power".
8: Open the Settings tab. Select "Run task as soon as possible after a scheduled start is missed". Select "If the task fails, restart every:" and set it to 1 minutes, 10 times. Unckeck "Stop the task if it runs longer than 3 days". Leave the rest as-is. Click OK.
9: Create a new Task. Name it something like "Sound Driver Delete" and select "Run with highest privileges"
10: Open the Triggers Tab and click New. From the drop-down menu select "At log on". Select "Delay task for:" and set it to 2 minutes. Click OK.
11: Open the Actions tab and click New. Click Browse and select your .bat file. (The .bat file only needs to contain the following string: "move c:\windows\system32\drivers\rtii2sac.sys"). Click OK
12: Open the Conditions tab and uncheck "Start the task only if the computer is on AC power".
13: Open the Settings tab. Select "Run task as soon as possible after a scheduled start is missed". Select "If the task fails, restart every:" and set it to 1 minutes, 10 times. Unckeck "Stop the task if it runs longer than 3 days". Leave the rest as-is. Click OK.
Now, when the tablet boots up, it will automatically install the sound driver, then 3 minutes later the second task will delete the rtii2sac.sys driver file from the system32/drivers directory that is causing the device to hang on boot. The tablet will hang on shutdown and restart but holding the power button for 3 seconds at this point will shut it off.
To test the tasks, right click the Sound Driver Installer and click Run. Wait for the installation to complete, then right click the Sound Driver Delete task and click Run. Check C:\Windows\System32\Drivers to ensure rtii2sac.sys is gone. If so try restarting the tablet. If it hangs on shutdown hold the power button.