I do turkey frequently. I've given up on whole birds (and given up on the skin even with the boiling water trick). Breast 160, legs handle 180 no problem.
With that said, brine is they key as you've highlighted. I make my own and I shamelessly use liquid smoke.
https://pelletfan.com/index.php?topic=2712.msg41289#msg41289Some of the players:
Liquid smoke, salt, brown sugar.
Then optional: molasses, garlic powder, smoked paprika, pepper, cumin. I've tried many variants, but that's about it.
Gotta be honest, 24 hours in the brine has never been enough for me. I go 48 to 72.
Cooking temp and time: This isn't quite as forgiving as pork butts, but close. I do turkey legs at 7 hours, 180 for 3, 225 for 4 to IT of 180. Sometimes I reverse sear to crisp up the skin, not really worth the effort. Your turkey you'll be watching the breast for a finished IT of 160. Nothing wrong with roasting exactly as you would in the oven. I tend to start slower to hopefully get some smoke flavor. 180 to 275 over 4 hours should be plenty.