I would avoid doing this like the plague, in other words avoid it at all costs.
The reason being is that I done this on my home cinema PC I think it was, or it might have been my arcade PC. I wanted to exit out and go to the operating system so that I could make changes. To my horror I could not exit to the operating system, so I was starting to panic, I eventually got back into my system and removed the instant sheller and would not recommend using one, unless you have your system 100% configured, but even then I would not recommend it.
If you want to do a poor mans version of this, change the windows boot screen, and have your desktop clear of icons and add whatever you want in your start up folder.
So you boot up, and HyperSpin loads straight away, on an SSD you will hardly notice the load time. At least this way you can still access your PC at any time.
Just my two pennies worth, it works for some people but not others, especially not if you want to make changes, especially for two seconds of loading time.
Regards
Mark