Hi liebenasuka,
I think you could setup units on the board (maybe using something to hide opposite side) and then reveal your armies.
Or you could even use step 3-6 from Don Clarke's ScenarioX deployment procedure
See here
www.commandsandcolors.net/ancients/Variants/Army-List/sc...army-list-usage.html
After secretly chosing your army composition roll a die (higher = attacker).
The defender now deploys their troops within two hexes of their base edge, light troops and leaders may deploy within three hexes of the base edge.
The attacker then sets up on the opposite board edge following the same rules.
The defender may now redeploy any two units to anywhere within two hexes (three hexes for light troops) of their own base edge. For this purpose a leader counts as a unit.
Please, give them a try and let us know your preferred choice.