Try the Aragon 8008 power amp along with a 24k Pre-amp.
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Maybe I am missing something, but it sounds as if you have no amplification for the MLs, they are hooked to the pre-amp outs. You would need to run the pre-out signal to a seperate power amp to drive the MLs. Then, if the Missions were not live, you could here stereo thru the MLs. If the receiver has a way of switching speakers off, you could swithc them out. Or, if it has an A & B speaker switch,you could put the Missions on A and MLs on B and switch on which one you want. However, be aware that ML speakers are notoriously hard to drive and the receiver may not be up to the task. You probably need to take special care to not have both speakers live at the same time if driven from the receiver, could cause amp section damage.
Oops, cancel that, I read your post incorrectly. Maybe when you take a signal out of the pre-amp out jacks, it cuts out the amp section completely. This is the case where there are jumpers between the two sections, and you pull them to take a pre-amp signal out. Don't know about that receiver and its pre amp out stage.