Sachin Mistry , Oskar Zielinski, Yes the glass digitizer can be replaced with out replacing the LCD, See how to in the 1st link and the 2nd link is a replacement part. Good luck.
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https://www.youtube.com/watch?v=iNSUOpRUXvU
http://www.ebay.com/itm/For-Motorola-Google-Nexus-6-Front-Outer-Screen-Glass-Lens-Replacement-Black-USA-/401125396027?hash=item5d64efce3b%3Ag%3A62IAAOSwXSJXPV13