I'm one of them and using activate the trainer could be little frustrated due unable to hear the sound if trainer is activated so I just use Alt + Tab go back to desktop to check if trainer is activated before start game.
It will nice to have small text on top left of screen and saying trainer is activated or something.
Nice meet to everyone here.
Uhh well when the trainer is successfully activated on the bottom part of the trainer it'll say "Game Found! Trainer Activated!", you could just Alt+Tab to the trainer and see it. If it isn't activated it'll say "Run game and press F1 in the menu. Numlock is ON."
Well what you can do is press an option that has immediate effect. If it shows effect - Then you can confirm that the trainer has been activated.
I am sorry for your disability, but your request is not a very popular one, so I doubt on whether it will be taken under consideration or not.