i use task manager to play a playlist as my alarm clock. i am sure you could record an annoying beeping noise and tell it to play that instead. task manager rulez!!!
to be more exact, task manager lets you specify what days of the week, and you can create a job that will go at 9 one day 10 2 other days and not go on the weekends or whatever, task manager is completely customizable, you could even create multiple jobs to do it, but there are custom settings to only have one job do all those different times. dont be afraid to ask me if you have any questions