I'm currently winterizing the entire driveline of my '15 GMC Sierra. New battery, spark plugs, wires. Front and rear differentials, transfer case and transmission. You can definitely expect my Honda engine removal / teardown when I get notice from my local Honda Power Equipment dealer customer callback to see if an exact engine is readily available from their warehouses somewhere in the USA to ship to me which is probably the route I'm taking warrantywise. Here you can see I'm mechanically inclined to tackle the job. Been wrenching on Chevys since I was kid. Spraying down the black oxidation before it's refilled with Amsoil 75W90.I would overfill the crankcase with whatever you decide as to soak the the rod and crank if that rod is seized on crank journal.
it just seems like there is permanent damage here anyways but it's always nice to try.
all this time you could have opened up engine by now and found out what's going on.......