I was faced with this problem a couple of years ago.
I was rebuilding a XT600 43F,same as a 34L apart from tenere tank/seat /sidepanels.On my bike all the gears needed replacing as they were were starting to pit  .
I ended up taking the expensive route and going to Dave Lambeth.
I only live a couple of hundred miles from DL so I decided it would be better for me to take the motor to him,he fitted a later gearbox modified to fit in the cases.Dave rebuilt my motor with the later oil pump and a host of other stuff done,rebore/new valves etc.
Obviously this is'nt practical for you, but you should ask him how much would it cost to get the modified gearbox sent to Oz.
If you do'nt want to go down that road,you could always fit the original gears & replace them again when they start to wear,obviously that's just swapping like for like.The oil pump is a straight swap.
Here's a link to the rebuild My XT600 project.. - ADVrider
Mark
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