antesignani

is there a way to make the antesignani available post-augustan reforms? ya, i know, i was skeptic about them at first, but when i tried them out in a real battle against hard enemies, every one of them is like a son to me. too bad i put them on the front of the line. heres my battle setup for my main army which goes agianst the Sweboz hordes, commanded by my faction leader, a 4 star general:
https://i199.photobucket.com/albums/...deployment.jpg

havent lost once using that setup! btw, the antesignani unit 2nd from right has 2 silver chevrons- they are my prize unit. god knows why they are there and not in Rome! now there is a lull in the fighting. that army is stationed on the border of gaul, my provinces, and the sweboz, to watch out for any marauding barbarians.
anyhow, i want to know if i can make them available in the augustan period, not only the marian. thanks!