[Roadsters] counter gear busted in 4 speed transmission

[Hoon Kim]

So I finally had some free time to tinker around my spare  
transmission and finally found out what was wrong with it.

It is a 4 speed, I believe a servo style transmission and the 1st  
gear on the counter gear is busted. All the other gears seemed to be  
fine.

Now, the transmission that is on my car currently I think has a bad  
counter shaft. Now the question is:

A)
Is it possible for me to either take out the counter gear from my  
installed transmission and put into my disassembled one (granted that  
they are both servo style) without taking out the transmission in the  
car?

or B)

same situation but replace the counter shaft in the current car instead

or C)

take out the transmission and frankenstein a clean transmission  
between the both of them?

Any help would be appreciated. Thanks!

hoon

early '67 1600