They are well known to anyone that was interested in Elite. BBC Micro has the best Elite version, after all :)
That said, that ATX4VC thing looks fantastic. I have recently restored a MSX computer back to life, but I think the power supply is unstable and crapping up when the machine warms up. It also contributes significant noise. Maybe it's time to replace with a modern PSU instead of spending time trying to fix the wimpy transformer-based PSU.
EDIT: I realize that cheap devices like this already existed. But this one seems to be much more complete (and trustworthy!). It's too bad that many printers use 24V rather than 12, otherwise this would be helpful for those scenarios too.