This is actually a very good question, but given how pathetic the AI usually is, I believe that no perticular solution would be completely satisfactory. Two possible solutions however come to my mind.
1.- The easy one is to add into EBBS a code giving the Romans some extra money each turn, for example:
Code:
monitor_event FactionTurnStart FactionType seleucid
console_command add_money seleucid, 5000
end_monitor
2.- The more interesting one: role-play it. I mean you can imagine that you and SPQR are especially close allies who joined together to defeat common enemy, say Carthage. You will do all the fighting, but give the conquered territory to the Romans. Then you leave them alone for a few decades so that they actually get hold of the newly acquired territories. Then you can just wait until they stupidly attack you. Once you will have common border it is always just a matter of time... 
3.- To make their units stronger for AI only should in principle be possible: You can search for roman units in the EDU and change the value of secondary hitpoints from "stat_health 1, 1" to "stat_health 1, 2". That should make them stronger in autocalc. This method is used in EB to make horse-archer units and thereby nomadic factions a bit stronger under AI. I am unsure, however, if this method is usable for infantry units as well (the second value is supposed to represent the hitpoints of the mount, IIRC).
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