M33 gearbox issues

[Rog1]

I've pulled the outer cover from my M33 gearbox to see if I can do anything about the less than precise gear change. Doing something about the multitude of worn parts I've found is well in hand but I have a few questions:

1) Can the pedal shaft bush be removed and replaced from the inner gearbox cover without removing that cover, and am I right to assume the new bush has to be reamed to size?

2) It would be folly not to replace the ratchet lever sleeve bush in the outer cover at the same time, so does that need to be reamed to size, too?

3) Some of the inner cover has been worn away, I presume because the kickstart return spring is not the right one. There's now a hole which I think is revealing part of the speedo drive. Previously there was a cracked section here, which seemed to be the result of the speedo drive being forced into position.

There's been no hint of trouble from these cracks or the hole, but how concerned should I be?

Here are some photos.