How to invoke Dictation & Speech with a keyword

Hello,

In Yosemite command and control Speech functionality (found under Accessibility in Mavericks, and called Speakable Items) has been combined with Dictation & Speech control panel. I like what has been done mostly. However it's caused me a new challenge I'm not sure how to solve. Let me explain.

Since Snow Leopard I've used the command and control Speech functionality in OS X. It was very useful to me because I could invoke it by just prefixing the command I wanted executed with a keyword. For example I could say: Computer Apple Menu to open the Apple Menu, Computer Microphone On (to execute an AppleScript I wrote to turn the Dragon Dictate microphone on).

Executing custom commands is still possible in Dictation & Speech. What doesn't appear to be possible, or at least I can't find it, is a way to invoke the speech command using a keyword (i.e., hands-free). You apparently now have to do some sort of shortcut to activate Speech. That involves a keyboard or mouse action. I haven't found anywhere to use a custom keyword or phrase.

This is a problem for me because I am physically disabled. Paralyzed from the neck down. If I'm sitting in my wheelchair I could pick up my mouthstick and do one of the keyboard shortcuts. However, I don't always have access to my mouthstick. Sometimes I'm using my computer from bed by voice only. It appears with this new system without a keyword to invoke things, I'm out of luck.

If I have missed something, or you have an idea for a workaround, please let me know.

Thanks...

Todd