Except for the fact that by the time you notice it there is a tremendous amount of clutch material throughout the trans, it is almost as easy to replace the reverse clutches as a thorough front pump reseal.
We have done a few, but don't anymore after spending hours trying to get a few to shift right later when pieces of the old clutches get in the wrong position in the valve body.
The problem is easily fixed if done before complete failure and a good independent will save you some money. We do the whole job, complete overhaul with modifications for 1600, installed, filled, adjusted and out the door. We have done hundreds and never have mechanical failures, only an occsional shift irregularity.
Bosch Master, ASE Master, L1
33 years MB technician