I read that one. From what I understand, wouldn't that require you to do that every time you switch your emuNAND?Not all of the CTR-N ones. There are only about 8 that have to be deleted. The top screen you should see a string of number that look something like 020000200 or 000400e7 (not these exactly, these are made up for demonstration purposes). That string of numbers is the title ID. Every region is different so I can't tell you what they are. You have to look them up.
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That's actually why I have been on these forums all day. As far as I can tell there is no way unless you have a SecureInfo_A from a system that was never connected to the internet.
There are some steps in this guide you can try. It did not work for me but it might for you. There is a section specifically for eshop.
https://gbatemp.net/threads/3ds-region-change-tutorial-easy-way.386207/
It would be cool if I can easily switch between SD cards, and having the eShop work fine on both automatically.