Also, bitlocker is not the only disk encryption software for Windows. It's just the built in one. If you wanted, you could use something like Veracrypt which is open source and will play nicely with all your OSes.
Never run a lemmy server but I can't think of anything offhand that would change lemmy configs. Honestly, IDK. You'll likely have to reconfigure your network card but that would take all of 30 seconds.
Skip Best Buy and those guys. Find a local mom and pop repair place. They can likely use and resell some of it and are more likely to actually recycle the rest.
Those are the ones I would attack too. I'd also like to send a shout out to the 5 corroded ones on the right.