Soft button cable torn during digitizer replacement, options?

I was taking the screen assembly off of an S5. Well, the warning in the guide was right:

"These cables are thin and easily damaged, therefore be certain you are only peeling them off the display assembly and not lacerating them."

Since the entire front of the device was thoroughly shattered, I was pulling individual shards of glass from the strip of adhesive. In the process of doing that for the left soft button, it tore off. I can't seem to find any replacement parts for that, and I'm wondering if the device has any chance of functioning without it. I certainly don't mind just switching to screen soft buttons, but if there's a chance to replace the part I'd like to go for that.