I'm not sure you'll get many answers because the description of your game world etc is pretty vague, so requires a bit of mental heavy lifting on the part of respondents. What I got from your post is that its a sci-fi RPG (but text-based?). That's about it. ;)
Also you might want to consider the more obvious ways of getting into the future, e.g. cryosleep or relativity effects, unless time travel is a big part of the game. The problem with time travel is it raises a lot of "why didn't they just fix that with time travel" questions.