Hi, this bid only for consultation purposes. You must (CAN) do it with playlist automation software. If you are Radio On AIR, then your automatization software does it... or anyway if you are pro broadcaster - then you doing playlists... There isn't any other stuff to do this...
Of course you can try to for ex. record your mouse position and click with mouse recorder and set to do this on time, but its only a small trick... Nothing will help you unless you use radio software.
Other solution - read the manual of streaming software, maybe there is some API codes, but if there could be - then you have pro software, as this can be done again via automation.
You can contact me, and say what exactly you use, then i can check is it possible or not.