I don't know if I can answer each one, but as far as stock weakness, I don't sense that at all to be an issue, in fact the whole wrist area seems very stout.
And it would appear that most of you would agree to patch it with wood, which makes sense for as deep as it is, however I'm not concerned about trying to hide it, in fact I would like to enhance it, I was thinking of a wooden plug to match the contour of the bark edge, and allow it to show it's edges even if the epoxy shows, which is why I'm looking for some dark epoxy, as I mentioned earlier, here again I'm wondering what epoxy would be best for a deep pour, and I did see a YouTube video where someone was using a dark TOTAL BOAT ( brand name) epoxy for filling knotholes, I'm sure there is lot of options available, I was just wondering what you guys were using?
There's some pretty neat stuff out there as far woodworking goes, it seems like the in thing right now is, using old boards with cracks or knots for table top or counter top or some surface boards then fill it with some colored epoxy. Pretty cool! But I know this a gun we're talking about, and it may not have anything to do with it, but I thought it was worthwhile mentioning.
Anyways I appreciate all of your comments!