How much tweaking would it take to make this theory compatible with the evidence available to PCs?
"The Pandora Gates aren't actually wormholes, and they don't send anyone to other stars at all. All they really are are very efficient nano-disassemblers, nano-assemblers, and computronium. What happens when someone goes 'into' one is their body and mind are broken up and recorded, and a copy of them is run in a simulspace set up to look like a world around another star; and when they come back, they're just rebuilt with their brand-new memories. The Gates have their own comm network that uses clever tricks to keep from being detected, so if someone goes on a trip through several Gates, they just egocast the gatecrasher to be rebuilt by another Gate. The people who've built physical starships and are crawling along at a fraction of lightspeed are going to take centuries until they can transmit the evidence that this is the case... and in the meantime, who knows what secret psychosurgery might be performed on gatecrashers when they're rebuilt?"
Thank you for your time,