Creating a personalised Timer

Hi all,

I work for an organisation providing support to people with learning disabilities, autism and other support needs. One of the difficulties that some people we support have is understanding time. This can be difficult for example an individual not understanding when the pizza will be cooked

There are timers which will change colour as time passes but this is difficult for some people to relate to the task in hand. 

What I had wondered about was being able to create a personalised timer where staff could add in a picture (eg of a pizza), time (eg 20 minutes cooking and 5 mins cooling) and perhaps music.  This then can be shared with the person we support on tablet or mobile phone with the picture gradually being revealed then fully revealed at the set time. 

To make this as flexible as possible would need the staff to be able to input the image and time rather than the storyline editor. I can see how to create a reveal clock however am unsure how to make this as adaptable as possible.  Any thoughts ideas helpful please even if to tell me cann't be done. Thankyou.