As far as I know there isn't a current modification allowing the Romance of Mira; Shem often makes video's and screenshots that aren't actually mods for the game, i.e. putting in dialog to a screenshot via photoshop. As for why this mod doesn't exist - the answer is simple no-one has made it (yet).
Nor do I understand why you are attacking, say me as a Moderator for pointing out the mod doesn't exist. I have no say over what mods are made in the community or not. Nor do I know if any modders will take this request up or not. -- j7
"Love is the only reality and it is not a mere sentiment. It is the ultimate truth that lies at the heart of creation." - Rabindranath Tagore
"Many a doctrine is like a window pane. We see truth through it but it divides us from truth." - Kahlil Gibran