Since you are obviously knowledgeable and proficient at working on your car, I'd start with anti-seize and see how it goes.

Starting at about 90k miles, ours has had a plug that loosens over time. I just have to re-torque that plug every 30-40k miles and all is good. I'm holding the loctite as a back up plan if it gets worse.

 

When you say "thread repair device" are you getting a "chaser" that cleans up the existing threads? That's probably a good idea since there looks to be a ton of blow-by.

After looking at your pictures, I think it is a good idea to start over with new plugs & coil packs.

To do heli-coils, inserts, etc, you would have to pull the head.

For me, I properly torqued all of the plugs but #2 & #3 came loose again. I used some (not gobs) of the Permatex Threadlocker Paste (blue) at around 40K miles and the plugs have stayed tight and I almost have 70K miles on it now.

Great work.

 

 

Believe it or not, it's popular to just do it with the head and everything in place. Not just Honda's with this problem through the years and people do the repair without disassembly.

On my friends GE, we pulled the head because he wants to keep the car long term. He took it to a machine shop and had all 4 plug holes redone with steel inserts.

Robby, out of curiosity, which cylinder number was it with the damaged threads? Cylinder 3 on our GD and my friends GE.

 

 

I don't have any explanation, but that seems to be the cylinder with the most reported problems. No idea why.