With this phone, you would need new adhesive. I would recommend using the 2mm Tessa 61395 tape ( Tesa 61395 Tape )
The digitizer may be built into the LCD panel it self, it's not uncommon. If that's the case, no, it would not be possible to replace just the digitizer. And the cost to difficulty ratio would be rather low
The LCD assembly consists of three layers(typically); Glass lens, digitizer and the LCD panel. That being said, yes, it is possible however impractical. As Danny said it's much easier to replace the entire assembly, even if it cost a few tens of dollars more. I always recommend replacing the entire assembly whenever possible.
Very well written! Nice job! You took wonderful photos and had a very detailed and methodical repair guide! I would suggest to link the tools you used, or would use in the header of the guide. As well as a few wider angle shots of some of the close ups would also be helpful for the reader to help oriente themselves where they are in the phone, also simply for more detail and insight into the phone.
Well done Brennan!
The plastic cards ( Plastic Cards ) would be the perfect tool to assist you in prying out the battery.
The wide connector next to the battery connector is the extension cable to the replacable charge port assembly at the bottom.