Just use the well know script to activate it and send a donation to MS or something. The margin of profit from individual keys is nothing.

(Can I post the link, to the open source repo? Is it against the rules? I mean MS owns github and has no problem hosting it)

> Is there a decent way to buy this LTSC edition of Windows?

If you are a student or work at a supported educational institution: I think Windows 11 Education is to my knowledge basically identical to Windows 11 Enterprise (at least for Windows 10, this was the case). In these versions, you can use LTSC updates if you want.

It depends on your definition of "decent". Legal: yes, simple: maybe not. Search in past threads.