I know of no reform of the basilikon agema. Gabinius, governor of Syria, restored Ptolemaios Auletes to the throne, and all or most of one legion remained in Alexandreia. That's not exactly reforming the agema. Besides, the basilikon agema (also known as the thorakitai epilektoi and a few other names) already looked, you might say, rather like a well-armored legionary: they wore either good quality mail, or iron cuirasses, seem to have used a Celtic-derived stabbing sword or the long xiphos, and may have carried a javelin along the lines of the Galatian gaison. They had also been organized in "centuries" for roughly 100 years, so there's not a whole lot that would be changing anyway.
But no, since Gabinius' troops are actually Romans, we won't be making a new unit. In fact, in EB the situation would play out as follows: you bribe a Roman legion from Syria, and use it to regain rebel-held Alexandreia. Its not a unit you recruit, but you could still end up with legionaries in Alexandreia.
Let me know if there's some source I'm missing, but as far as I know, what I've stated above is accurate.
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