It'll never work.
Every few years, someone thinks "I need a gender-neutral pronoun, but people don't like singular 'they'!" and makes a new pronoun. As a result, we've ended up with this mess.
The pronouns don't stick, because:
- Most people use singular "they" since it's more familiar and widely used.
- The new pronouns are often considered twee or grating or confusing.
- Pronouns are a closed class in English, so it's very hard to establish a new pronoun.
- There are too many alternatives to standardise on one. Your proposal avoids this particular pitfall by suggesting an Official Stack Exchange Pronoun, but not the others.
Your proposal would simply result in the status quo: most people using singular "they", a handful of people using each of the many neopronouns, some holdovers refusing all gender-neutral pronouns.
Moreover, many people are uncomfortable with neopronouns: if you're trying to express respect of someone, e.g. a non-binary person, imposing an arbitrary pronoun may backfire.