I don't see how you would press the shafts into the side door bearings properly without taking the shafts out.
Good luck to you. I've only did this once with my 5 speed, and if I don't have to do it again that's OK by me
One thing that worries tho, what about the other bearings if one of those is bad? Just sayin
The shafts are threaded. I could make something up to push them back on. Getting the old ones out seems to me to be the bigger hurdle. So far, I haven't come up with anything that isn't more work than just pulling the gearset out.
So, are you going to tell us how you managed to get the side door off?