Yes, I would definitely try to salvage the flitch. I envy you owning a big saw and a CSM. Route out/grind out the rot and pour epoxy/stones etc into the void. Add bow ties as you suggested. Put on an outdoor finish.Back at the scrounge spot trying to get something useful out of what's left. Had a little bit of rot in it unfortunately. Also needs some bow ties to control checking. Thinking about an outdoor serving bench for BBQ's, one end flat up against the wall. Gonna run it through a friend's thickness planer and then decide if it's firewood or not.
It wasn't fun dragging this 40m back to the car solo.
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Is that an outdoor wood?