I agree, I wouldn't inject anything. It would cause a lot of splatter.
You could brine the bird though. Be sure to drain well and pat dry before submerging into the hot oil - again, to reduce splatter. Here's our favorite brine for all poultry - just adjust quantity for the size of your bird....
Poultry Brine Recipe:
3/4 cup coarse kosher salt (or 1/2 c table salt without iodine)
3/4 cup sugar
1 cup boiling water
1 gallon cold water
1 tablespoon pepper
Sprigs of thyme, rosemary and/or sage - optional (use your favorite
herbs)
A heavy-duty plastic tub, stainless-steel bowl, or resealable
plastic bag can work as a brining container, as long as the poultry
is fully submerged. Weight with a plate, if necessary, to keep the
meat fully covered by the brine.
To determine how much brine you'll need, place the meat to be brined
in your chosen container. Add water to cover. Remove the meat and
measure the water. Adjust the recipe above to make enough brine to
cover the meat.
Dissolve salt and sugar in the boiling water. Add it to the cold
water; add pepper and herbs, stir to combine. Chill brine
completely in the refrigerator before adding poultry. Place your
poultry in the water and place in the refrigerator for the time
required.
Rinse poultry twice after removing it from the brine solution;
discard brine. If you are not ready to cook at the end of the
brining time, remove and rinse the meat. Refrigerate or freeze until
ready to use.
Brining times:
Whole Chicken (4 lbs) 4 to 12 hours
Chicken Pieces 1 to 1 1/2 hours
Whole Turkey 1 to 2 days
Turkey Breast 5 to 8 hours
Cornish Game Hens 1 to 2 hours