You've already found all you need, just haven't realized it. Populate the remote with codes from multiple databases. Use the codes for STR-D965 for all buttons except power on and off, then drag the discreet on/off codes from the other generic Sony databases.

It's a pretty simple matter to test the discreen on/off codes, find the ones that work and drag them to new buttons. While you're at it, you might also find some other useful codes that don't exist in consumer databases.