Quicker way to get blueprint parent class via python? (UE)

Is anyone aware of a way to get blueprint parent class without spending time loading the asset?
Currently this is working but it takes a while to load each bp class default object.

bp_class_object_path = '{}_C'.format(asset.object_path)
bp_gen_object = unreal.load_asset(bp_class_object_path) #this is the slow bit as it has to load the object
blueprint_class_default = unreal.get_default_object(bp_gen_object)

Thanks in advance!

Richard G