That's a lot of space taken just to work only the smaller, outer part of the calves. Just use the same barbell used for squats or a squat machine and do standing raises, which hits the larger part of the calves.
Good recommendation for 'economy". However, if he can afford to get a seated calf, he should. Never neglect soleus training. Never I tell ya, never!
The soleus is also hit when the knee is not flexed.