Glad that was helpful to you!! I used to buy LTSC VLKs (which can be converted to IoT after install) on Ebay for like $15/seat, but they seem to be drying up so I don’t have any sources I can recommend.
Your response turned out to be a bit of an epiphany for me. I tend to hold on to computer equipment for a long time. Hoarder might be an accurate descriptive term. We have three computers that work well with Windows 11, but several others which for various reasons are not as suitable for it. These are computers that I actually do have useful purposes for work very well with Windows 10 Pro.
I have spent the last several days experimenting with Windows 10 IoT Enterprise LTSC 2021. I believe that it will be the best solution for my computers that do not play nice Windows 11.
If one uses Google with the search terms: “Windows 10 IoT Enterprise LTSC 2021 Key”. Numerous vendors claim to have keys available from $10 on up. I have had good luck previously with keys purchased from a vendor that was asking $22 but gave a 15% discount with a code that I found online.
I am not completely sure of the legitimacy of this key, but the vendor has not let me down in the past. So, I will keep my fingers crossed.