Inspired by this post I threw together a new open source desktop app that has an annoying always on top window that has a flashing timer, this seems to accomplish the same thing. https://github.com/timsayshey/cringe-clock
Jokes aside, whatever works...
For me a side device with a pulsating red light with a heart sync for the lope do the gig!
Deadlines comes free.
Nice one!