Actually the MoT reform does not allow for new barracks; it just changes the recruitment options in the old one. EB's scripted reforms do enable a new barracks, but this is done indirectly by placing another "building" (like the "Polybian Military Era" markers) that allows for the construction of the new barracks and disables the old one. Another part of the script replaces the barracks when the Marian reform strikes, but that is not relevant here.
The Epeirotes do not have a scripted reform, so you cannot use this for enabling highways. Also: the team would have done this for the Gauls if they could. Since they didn't, I am guessing you cannot have faction-specific requirements for the construction of buildings. (The team got around this for barracks by creating a separate barracks-line for every military system.)
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