Hmmm...
We didn't change anything in Unofficial piKey 0.4 when it came to SIO stuff, butyet, we didn't test it either. Try going back to it's roots:
Install 3.40 OE A then install pikey 0.3. Check if it works that way...

Worth a try isn't it? If that still fails to work, mlet us know and we can help you out. We have a few soarky people on this forum!