Time for a little support. Effectively, what I'm doing in the photo on the left, above, is 'extending' the soundhole braces to support the new wood. This area contributes hardly anything to the overall tone of the guitar so I'm not worried about altering its sound by adding reinforcement here.
And, speaking of reinforcement, that's what's happening in the photo on the right. Not only will these shaped pieces of wood help to support that newly glued soundhole edge, they will also strengthen it against future, vicious, pick attacks.
Once it's all glued up, I can shape the edge of the soundhole and round it over. That narrow circle of cedar would have been far to delicate to survive my doing that before it was part of the guitar.
Time for finishing. I'm doing something a little unusual here. I've finished this patched-in soundhole with cyanoacrylate (effectively, Super Glue). I wouldn't normally use CA for something like this but, in this case, it will soak into the wood and harden it. This will help it withstand all that pick-punishment in the future. I can tint it to better match the colour and, once built up and cured, it can be buffed to a shine (or in this case, a satin sheen).
Last step is to add a custom-shaped, clear, mylar pickguard to a wider area of the guitar. Again, this will give a little more protection to the top. I've replaced the existing pickguard on top of that to keep the guitar looking original and give one more barrier against future damage.