I have one of the first 5K iMacs from 2014. I contemplated doing a similar project but I don't really want to destroy a perfectly fine computer. It doesn't run the latest OS, but it still runs the latest Chrome though. I often use it to SSH into a more powerful machine for coding, and I occasionally use remote desktop.

If Google decides not to support this for Chrome, I'll firewall it from the internet but still plan to use it as an SSH machine.