I was just looking at the WRG website and reading the draft army lists for Section II of the upcoming DBA 3.0 rules and noticed that the Armenian list I am building has had a change! Instead of 2x2Ps it is now 2x(Ps or Bw), so that means I can build two more elements (six more foot archers) in order to have some options!
I am not sure under what circumstances I might use the Bow elements over the Psiloi, but options are options.