You're quite right, the support finished a couple of months ago. Although I have saved all the security updates prior to support finishing, it's unlikely I'll need them. All the security problems stem from the admin features embedded within windows, but these can be removed with this program:
I have removed all the rubbish that windows doesn't need, which has reduced the size of the basic windows to 220MB in my case and made it a much more stable operating system, also without the inherent security problems.
I think the cost is about $25.
It might not have answered your question directly, but I think it's a good alternative.