there are plenty of options for ostheer, what most probably already has been mentioned but i can think of
mortar
schrecks
fast 222 (against early pit)
flamer hf
any tank expect ostwind(?)
and pwerfer
No, 1 Bofors + 1 Mortar pit close to each other will defeat anything for cost. The brace makes them invincible for a chosen time. Then the Ostheer infantry moves in and gets shot down faster by the Bofors than the mortars, Schrecks, 222 etc. can kill the emplacements.
Tanks and Panzerwerfer arrive after the 15 minute mark. The game is lost by then.