Can I change glass to non-original lcd?

Yes it is possible. It's a rather difficult repair though. It requires disassembling the phone, heating the screen and then using something to slowly pry away the glass. It is very easy to crack or burn the LCD in this process. And then as far as reapplying the glass, if you want to do it right then you need LOCA glue(the clear glue holding the glass to the LCD), good adhesive, and a UV curing lamp. You can do it the cheap way and just put the glass on without the LOCA, just using the adhesive on the outer edge of the glass, but that is not a quality repair and will look terrible. There are many videos on youtube about how to separate glass, but if you don't have any repair experience, I highly recommend you take it to a professional as it will be very easy for you to break the LCD