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I've seen quite a few blown head gaskets and they all produced very little oil in the coolant. Usual result is combustion gasses in the coolant that usually raises the operating temp since the gasses displace coolant resulting in hotter running. Just a very light film present on interior radiator surfaces.

Much more common to have coolant in the oil since the coolant is under pressure and very few places in the engine where oil is under pressure to force itself into the coolant.

The ruptured trans cooler in the radiator tank still sounds like a possibility. That would force trans fluid into the coolant while engine is running, and unfortunately allow coolant to creep back into a split cooler once engine is shut off and pressure goes away. How does the trans dipstick look right after engine has been run?
 
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