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It appears that
AuroraWright's claim on Nintendo having an NGCert (Wii)/TWCert (DSi)/CTCert (3DS) database was correct. In fact, all of the device certs appear to be combined.
Here are the end results of what happened to all of my device certs that I used.
* The first one was banned after 7 days + a lot of Miiverse hax and PC requests.
* The second one was PF2M's. According to him, it got banned after 1 account. He may've used a PC to send the request for this.
* The third one was banned after 10 days. I made the requests on this through a 3DS. Everything checked out legit, except for the device cert belonging to a Wii..
* The fourth one had 6 accounts on it. They were all for Miiverse hax, but this still got banned. I had logged on to this with cert #3's IP.
* The fifth one wasn't even given a chance. I had logged on to it ONCE with cert #3's IP, making it in common with the fourth cert. No accounts were made on this, but it was banned anyway.
* And those were all of them, I have no more.
Another thing, cert 3 didn't have its account banned from Miiverse, it's still up. Not sure how long until it's noticed though.
I think we can come to the conclusion that this is unsafe AF just because Nintendo knows we're using Wiis.
I will be releasing a guide when I can get to making it soon though, just don't expect to be using something like this.
Sigh.
Edit: Can someone tell me if it would be fine to post Nintendo's client certificates on GBAtemp, or at least who to ask?