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Kinda hard to say whether it is worthwhile pulling the water cover (and compression relief chambers) off this head. I would think that if there was a problem, the chunk would be stuck in the inlet or outlet from that chamber and that you would be able to see it by looking at those spots in the head. Once in that chamber, I don’t think an impeller chunk could cause too much trouble.
Again, I would examine that vertical tube in the head, along with the angled passage at the bottom of the head.
Unfortunately, I am not too familiar with the water flow on this engine, perhaps someone else can chime in.
You mention that there is plenty of water flow out of the thermostat cap when the engine stops pumping/overheating, so that should rule out some passages.