There is no “guide” to proper refurbishment of an iPad Air 2 screen. Those that know how to do this learned it the hard way :>).
Your idea has merit but separating the front glass from the LCD is no easy feat and requires some special tools to do properly. Even then, this is something that would require some practice before getting the process right. I don’t say this to discourage but just to give you the proper expectations.
Apple has gone to fused displays on the Air 2, mini 4 and the Pro line. This is just like they do on the iPhones. The reason they do it is because it gives a much better image display as there is no air gap between the LCD and glass.