I'm a pretty big fanboy of Obsidian, but I'm not sure if they would've been the right studio for this. There are a couple of reasons for this.
Thank you for that wall of text. It really well expressed, what I couldn’t put into words myself. As much as I love Obsidian and Baldur’s Gate, I don’t think the two are quite on the same page. Obsidian’s strength was always departing from pulpy adventures of DND and safety of Bioware style RPGs.