If you check the Sony remote control site:
[Link: hifi-remote.com]

you'll see that the VIDEO7 button comes from a totally different device code. There's no matching OFA setup code for that Sony device code, so there's no way to re-create it without JP1.

I should point out also though that the 9960 is modem-equiped and the very latest version of IR.exe (the main JP1 program) is capable of creating WAV files, so you can use it to load upgrades without using a JP1 cable if you want.