Here’s my latest graphic in the alarmclock I got on special for about $12. I added hours around the purple circle in case the clock is also wanted for use as a chronometer!
It only takes unscrewing the legs of this model and you can replace the face with a printed one as I did… I printed it on 250 gsm plain card , colour inkjet. Here’s the jpeg I printed it from in photoshop, using the print to a custom size option. in this case 105 mm. I used a leather punch to make the central hole – nice and neat. Use this, free, to make your own phasetimer!