OP, you have house cats AND you need an alarm clock? At our house, the kitties wake up up at 6:30 to be fed. No way to sleep through having your hair pulled, while another jumps from the floor and lands solidly on your tummy.

Saphire, we have two kitties that look like yours only slightly different. The on in front looks like my Midden only his little black spot on his face is on his chin. The other cat looks exactly like my Bot who is merely short haired!
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I make a mental note to wake up at whatever time I need to get up, and I do. Every time, no matter the time, no matter how tired I am. Need to get up at 3 am for a flight, make a mental note before I go to sleep, wake up at 2:55.
I don't know how...
I still set the alarm, but it never gets a chance to go off.
..it worked for me when I was to get up later. I have no idea why it didn't go off, or why I woke up..

I make a mental note to wake up at whatever time I need to get up, and I do. Every time, no matter the time, no matter how tired I am. Need to get up at 3 am for a flight, make a mental note before I go to sleep, wake up at 2:55.
I don't know how...
I still set the alarm, but it never gets a chance to go off.