I think Rogue One really needed a crawl. It’s really confusing for anybody who didn’t read Catalyst, and casual fans seemed completely lost. However, I like the idea of things being different than the main saga films. Here’s my idea for the opening.

A long time ago in a galaxy far, far away…

Play the prologue at the Erso homestead, probably edited down a bit.

Music ramps up. Cut to crawl.

(My quickly/poorly written crawl)
STAR
WARS

ROGUE ONE

The Galactic Empire rules with an iron fist. A fledgling rebel force desperately fights back against the Emperor’s tyrannical rule.

Unbeknownst to the rebels, the Empire has been constructing a space station capable of destroying entire planets, the Death Star.

As the project nears completion, captured scientist Galen Erso sends a sympathetic engineer to warn the rebels of the coming threat…

I think it’s best to then open on Bodhi arriving at Saw Gerrera’s before grown up Jyn’s intro.