I wouldn't trust anything closed source to forget that private key. I can't see how buying an actual cert could be more risky than installing a new root CA. Th

I wouldn't trust anything closed source to forget that private key. I can't see how buying an actual cert could be more risky than installing a new root CA. The goal of signing is to ensure origin and anti-tampering: two fails in this case. So now you may have a tampered with driver that doesn't remove the private key and uses the new CA to inspect your TLS traffic, and you wouldn't know.