I believe it was Siemens MC60. I remember getting my arm broken and then getting 10k CZK from the accident benefits. Parents asked me what I wanted for part of that money when I was in the hospital and I said this.
Then I bought a refurbished Treo 650 in 2015, an awesome piece of technology if only it had a WiFi (there was a possibility of a module that clipped on the back which had its own battery, or there were WiFi SDIO cards, but I, being a poor student who poured all his savings into the phone (yeah, very bad financial decision), couldn't afford either of them.
I still miss a phone like that, but with a modern chipset and maybe a better OS (but still somehow based on the PalmOS original path)
The Cartesian Principle is: "I think, therefore I am. And although you're not thinking, the computer is just making you think you're thinking; nevertheless, you think you're thinking, therefore you possibly are."
/usr/local/sbin/adduser.local
One line in there and you can make it add a new line with appropriate /home/userX/.cache tmpfs line to fstab.
Or, maybe a cleaner way, you might make a init/systemd service that, when booting, would run something like
for each dir in /home do
mount dir/.tmp -type tmpfs
done
I'm not at the computer now and I'm lazy to Google it, so this above is just a pseudo code and probably won't run.