I think that it is possible to restart Windows 8 with Windows 8.1. They run on very similar programs and formats. So I think that it is really possible to do such a task and operation. I think that it may require a bit of info and research to do so.
There is nothing that can not be created for one item, technology has really reached the heights of a new level, so who ever created windows 8.1 was probably thinking about the same thing. Through time all these different software for different computers has really made a change and done thing that has never been done before, you can just about download any thing, and mostly do anything with a computer so I don't see why it would be a problem.
Windows 8.1 is capable of restarting windows 8 after a recent patch. In order to make this transition you should reference the software companies website, where they have specific instructions on how to carry out this process. On 8.1's initial release this was not possible, but the company has generated a mainstream method to carry out the process.
No matter what Microsoft did to Vista, it failed and I think this will be the case with Windows 8/8.1. I think Microsoft fails to understand the vast wants and needs of its end buyer and that is the problem. People hate Windows 8 and there is little that a software update is going to do to change that.