97 fronts are smaller diameter even though the axle is the same. Their failure rate is no different than the later models. I think changing bearings as preventative maintence is not a good idea. They are an on condition item and if they are good there is no point in changing them plus I have seen some premature failures after replacement, and also have seen some bearing pockets messed up during replacement. However I do think its a good strategy to carry a spare front and left rear for 97, or a left rear for the later models which also fit the fornt. Right rear failure is very rare. I say this because I changed a left rear in a hotel parking lot one year at Bike Week. Was done with minimum tools and no jack. This was on the weekend and no shops were open and othrewise would have tied us up for three days. Sure saved the trip.
How do you do it with no jack? Center stand?