Another thought - in the meantime, buy a small timer that you can carry with you to whatever room you're in. Tom does this all the time, he'll start something in the kitchen and then bring the timer into the office while he's on the computer rather than relying on hearing the one in the kitchen.
I've used my phone like this so I can see it light up when the alarm goes off and My boss installed flashing lights for my shop phone at work, both work pretty well as long as I'm not distracted by something else. I was just thinking after burning a pizza (again
)while watching hockey yesterday, that maybe training my dog to help out would be fun and useful.