I've done a "engineer at the back of the train" shove move ..... once.
13 miles ... on the radio, calling clearance for every single straightaway, curve, and crossing.
It's very stressful.
Per most railroad's operating rules, the ONLY way this would be allowed is with a route certified observer in the front (ie: an engineer or conductor), calling the shove to the engineer, operating at restricted speed or less.
If you're gonna go to all that trouble, you may as well put the engineer at the front of the train anyways.
Not surprisingly, this is what the railroads do.