I did - in order to use characters that a friend and I had run in a convention Traveller tournament game. It was the late-1980s one where the PCs board a station "orbiting"* a black hole - our two characters were picked to guard the PC's scout ship after the first encounter with the "invisible" aliens. When the rest of the PCs tried to retake the engine room, someone threw a grenade... which damaged the controls, shutting off the M-drives that kept it out of the BH - we tried to get the scout fired up, but neither was a pilot so we failed, and went into the black hole with the station - game over!
We decided that, since the scenario had the aliens come out of a wormhole in the black hole, our two PCs could survive a trip through, and rolled them up as fully-fledged CT characters.
As I was running the game, I decided that the PCs came from a parallel universe where the collapse of the 2nd Imperium included a Vilani military commander taking a fleet to Sol and destroying Terra. As he had made his intentions well-known in advance, there was some degree of evacuation, and recordings of the event went with them**. My PC came from a world settled by one evacuation flotilla, which didn't regain contact with other systems until centuries later. My PC had been a police officer assigned to escort the "aliens" (Free Traders exploring for new trade routes), and they smuggled her aboard just before departure. My friend's PC was engineer on that ship, and we eventually ended up with the Merc group sent to investigate the loss of communication with the BH research station.
The trip through the wormhole trashed the scout, and only their having been closed-up in their work Vacc-suits (hard suits) and their ship having exited from the wormhole right next to a working ship (owned/piloted by the third player's PC) ensbled them to survive.
My PC turned into a terrorist (freedom fighter) when she learned that they were in an alternate universe where Terra was still intact - but was a captive planet under the rule of the Vilani! She vowed to see Terra free, or die in the attempt - and felt that the Solomani Confederation was useless, since they were "doing nothing to free Mankind's Home"!
* It was actually closer than a naturally-stable orbit, it was using M-drives to keep it at a steady distance, they were running at half-power.
** Every citizen of her world were given, when they became adults, a medallion with the inscription "Never Forget" - and containing a data chip with a recording of the destruction.