A lot of things can be divinely inspired, such as songs, missives, poetry, etc. I would even argue that they could be just as inspired as the Bible. However, that does not make them canon. The canon is a reed. It is a measuring rod. It is a standard against we compare other writings and ideas. A lot of stuff out there may be inspired, but those things also might not be inspired. Your standard for comparison is the canon. It doesn't have to be fully fleshed-out to encompass every single issue. It only needs to be absolutely reliable, and it needs to be complete enough to give us a full understanding of the nature of God's truth.
A lot of people argue that the canon is closed, and I fully agree with that, but a standard is there to act as a basis for comparison, against which all other claims of inspiration must be regarded. If we're not making that comparison, then we're not even using it as a canon. We can disagree on anything else, but the canon makes a backbone for our faith that we can all accept. Whatever comes along, I don't care if it was locked up in a cave with the oldest copies of the Bible. That doesn't make it canon. That doesn't even make it inspired. If you do find a spark of truth in it, and you do think it might be inspired, then that's your decision to make.
You might even be right, but it still isn't canon.