You did ask it, but it was buried in another thread and I didn't want it getting lost.
Depends on the % of the solution. Read the label. Worst case, I've seen 18 to 24% and there's no help for those birds.
You can inject, but the challenge is to inject a flavor that will go with whatever the "enchanced" solution is.
That's why I search for fresh, or non-enhanced or if possible less than 8% solution added. I still brine those for flavors.