Yes! I would totally support it. Give it to all units on the list, except:

The Ekdromoi, they were used to chase skirmishers and would thus not fight in the Phalanx.

The Thorakitai, they didn't fought in the Phalanx as far as I'm aware.

Units to further include:

The Hoplitai Hellenikoi, a Hoplite unit for Saka Rauka I believe with scale armour.

Units which previously had the vanilla Hoplite Phalanx.

And other units which fought in a dense shieldwall or Phalanx, like the Germanic spearmen, swordsmen and pikemen.

I also really hope that this can also be included for stardard EB!