I Just watched phillips 23 run and i noticed in the run he didnt shoot the train before the wall like before in 25 runs and he opened the door himself and it got me thinking;
If you used the original 25 strat and shot the train before the wall and got a fast enough guard reaction could you warp through the roller door to a already open second door. and im pretty sure the door takes a second or two to roll up and surely that would make 22 possible. obviously you would have to get a godly guard reaction and this is just my opinion i dont know if it would be possible ill leave it to the goldeneye veterans to work out what i mean and decide if it would be possible.