Even if its not actually actually using a Follow macro maybe theres a way to move everyone in a group while holding formation.

if you look in the keymaps group Non-combat there are two keys for Others turn right and left.

1a.jpg

So I copied one of them as a template and created keymaps for going forward and backward:

1b.jpg

I originally did this to actually move my group of followers instead of just turning to face a target for line of sight. And in writing this post I wonder if this would work: creating alternate keymaps for turn right/left and move forward/backward (ie: Alt-up arrow, etc) and then instead of the key controlling All others, make it control everyone:

1c.jpg

only problem is that this would work only for short distances because small variances in the direction individual characters are facing make them break away from the group.