Here's your save after the quest if you still want.
Thank you very much for the help, I was finally able to track down the problem. Hollow mentioned Chrome being present would bug out this quest, so I put two and two together.
There is a Patch edit that allows companions outside of your party to interact with NPCs. I believe it was posted somewhere in this thread as well, but removing it allowed me to undertake the quest normally.
Edit: Had a look at the Patch code and the way it achieves this functionality is by tricking the game into thinking you have all companions in your party; and since having Chrome tag along softlocks this quest, everything makes sense.
First time this was a problem, but I would normally recommend this edit or you'd miss a lot of interesting and funny dialogue from members outside of your party - and there's a ton of it, certainly meant for several playthroughs.
Here's the edit for anyone interested. The original file I found was made for v2.32 but I've adapted it for v2.35. Make sure to do a backup of the original Patch.rb for minor cases like these.