Looks like it’s been available on some android devices for at least a month. I don’t know about free though, I think it depends on your carrier. I know T-Mobile has been talking about supporting it using Starlink satellites.
https://www.reddit.com/r/tmobile/comments/1ct1no1/satellite_messaging_option_appeared_on_my_pixel_7/ https://www.t-mobile.com/news/un-carrier/first-spacex-satellites-launch-for-breakthrough-direct-to-cell-service-with-t-mobile
This is the best answer I’ve seen in this whole thread. You’re right that the key is not needed. Microsoft identified your system components and did the original activation based on the hardware you’ve got on your computer. All you need to do to bring back a licensed copy of Windows is to reinstall it.
On Debian, you have to be root or a sudoer. Those commands are there, just not in the path of regular users.
Just make sure it’s RFC 2324 compliant. You don’t want it throwing any HTTP 418 error messages.
If you’re having power on issues, I would make sure you are using a standalone power brick. I’ve used a Surface Pro for work and I’ve found that sometimes when connected to the docking station, it wouldn’t power on. When connected to a standalone power brick it usually would. For a standalone power brick, I’ve used both the one that came with the Surface and also a 65W USB-C adapter with a USB-C to Surface per cable.
I know that Pixel 7’s and above support it. There are Reddit posts showing they have the feature already. Satellite messaging is just using standard 4G/LTE from Starlink. I wouldn’t be surprised if this is only an OS update away for most newer phones.