That's a great idea.
I forgot the numeric password to my last phone (and saved it anyway). It got bricked, in other words.
I didn't think about it again until recently, when my roommate tried to steal it, and dumped it in my laundry basket. I never had it there. It was on my closet shelf.
It kept demanding the password, and when I couldn't get it right, it would set a timer to try again. It always sounded an alarm.
I had to put it outside in the laundry shed to let it run out of battery (87%) and stop sounding its alarm.
That is a Moto G with an LCD and low pixel density. My eyes strained to read it. Now I have an Edge with a OLED and a higher pixel density.
It would make a good second phone when I get my Pixel 10 XL (a Pixel, not mid-tier, and a very large screen are the reasons I want it,
although I hope it doesn't have a battery drain issue, and if I could find another flagship OLED phone, I'd consider it).
I wish I liked Samsungs phones, but their recent Amoled displays are overly bright to my eyes, anyway.
I tried a mid-tier model about a year ago and couldn't live with it.
I wish I liked Apple phones.
Yes, I'd like to have two phones.