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Since you have an input shaft bearing issue on a transmission you do not want to loose when it comes apart, disassembly is your obvious choice, especially if you have another transmission to use in the interim.
With your stated goal of driving this car for a long time, if you do not have a spare transmission, get one, maybe you will get lucky and it will be a good one. Then you will have no pressure to make hasty repair decisions and the luxury of time to learn to do the job yourself if you wish, or to find a tech who is conscientous and not too greedy to do the presswork to get the bearings on right. If you do it yourself just make sure you avoid pressing on anything but the part of the race that is actually friction fit to the shaft or the outer race if it is friction fit to the housing (very rare).
Doing the job properly and using the proper lubricants as well as your driving techniques will make the repair last a very long time, possibly until the rest of the car falls apart.
If there is still noise from the wheel bearings, then you will know that you wasted nothing taking care of the obvious transmission issues first. I never enjoyed listening to stories about techs who used customers precious financial resources in a "fishing expedition" of repairs, when a more thorough investigation would have saved a large amount of the repair cost. Of course if the tech is just dumb, then he can plead ignorance and keep on wasting money that lines his pockets.
regards
Mech
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