Respectful suggestion, cut a quarter round out of that log (if that will get all the rot).
Fab up a quarter round replacement (which will be timberLOK-ed into place).
If you need weight support, hide some short metal posts (with plates top and bottom for lag screws) behind the replacement cantilever.
You'll probably find more rot than you anticipate, any pre-plan will likely require re-consideration, and it'll work out fine.
I contemplate, how would this be in video versus text?
But then, I'm a bit archaic.
BTW, zero judgement from me. I've seen a lot of log rot progress unnoticed, and also progress noticed.
Just tossing in some cobra rots and annual spraying with borate can really help slow the rot with absolutely minimal cost/expense.
They are like the aspirin + bandaid fix, for an injury that eventually leads to real care.
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