Metcon Prep after strenght part:
3 sets
3-4 double db hang squat cleans
10-15 double unders
first round lighter weights, second close to wod weight and 3 set with wod weights.

Metcon
For Time
3-6-9-12-15 reps of
Double DB Hang Squat Cleans @12.5-15/20-22.5kg's
15-30-45-60-75 reps of
double unders

This will be nice grip test, and tests your skill level on double unders. Try to keep your shoulders as relaxed as possible on jump rope.
On DB Hang Cleans, you can try to let that "DB weight" part lay againts your hand so you dont have
to hold on that much of them. 3-6-9 reps should at least be unbroken but 12 and 15 reps may split in 2 sets.