My opinion is the following: If certain population of affrent fibrs within the injured periferal nerve is preserved, then an inramuscular or surface electric stimulation of innervated musculature is valid.
In complete axonal degeneration electrical stimulation in muscles as IDC can be used to prevent muscle atrophy up to 3-6 months but ES for nerve growth is a contravertial issue and usefulness is not proved.
It depends on the outcome of the S/D curve diagnosis (= the accommodation quotient). The closer the accommodation quotient gets to 1.0 the lesser the probability of valid rehab. The closer you get to an AQ of 2.7 the better the rehab possibilities are. The fact that there is no well established EB does not mean we can deny its possible positive effects. The least I would do is perform S/D, start treatment for at least 3 weeks and repeat S/D once a week in order to monitor positive changes.