I would play less
Gathering to the Summons, maybe 2 or 3 and 3 Visions from Afar. I would drop the Desert Legions and add another Captain. Another thing to do is drop 1
New Fear and 1
Surging Up and that should give you room for Polearms and
Small Hope. Another thing I found useful is
Easterling Regiment when
Easterling Captain is out.
Quick thought on the Freeps, Eomer's ability won't be useful because if you're getting companions with Siblemyne, you won't be able to grab the weapons or events. Probably TMotR is your best bet. Maybe also a different Eowyn, as you are not focused on wounding minions.
Dernhelm would be nice here probably.