in my Hai campaign I tried to replace my sparabara with armenian Spearmen as they are "better" against cav archers (better in terms of not ista dead) which come from the north and can hold against Seleukid phalanxes while the rest of your army(no matter if archers, slingers, skirmishers, HAs, Kinsmen or axemen kill them from behind, they all do it in their individual fashion and it all works very well(keep in mind armored phalanxes should be atttacked with either slingers axemen or Kinsmen)
It's not much of a great difference to the KH tactic expet that your pinners are weaker and your flankers are probably faster. ;) the more Hai like tactic would involve more HAs and not pinning the phalangites but to lure them with one unit and harras them with a second until the Phalanx is at quarter strength(or you run out of javelins :P ) charge in with all units availible. note that with your superior speed you can isolate phalanxes but still unite your army in order to swarm one of them to make them roit.
If outnumbered by phalanxes I would try to occupy two non elite phalanxes with one unit of Hoplites(or better) and break up one block after the other with my lance cavalry.
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