I don't think it benefits from low/slow. It gets tough/stringy if overcooked so that must be avoided.
I'd butterfly then straight-brine it (you could flavor-brine if you prefer). I'd make a simple saltless rub of a couple herbs and a few spices and mix a little of that into some unsalted butter that's been allowed to soften and this I'd gently work under the skin. I'd lightly oil the outside of the bird, sprinkle lightly with rub, then smoke/roast at 450 or so till the breast was just cooked through (with a hint of pink near the bone), about 30-35 min.
Or--
I'd butterfly it, cracking bones as necessary so that it would lay flat, pierce the breast and legs in several places (using a thin, sharp blade). I'd make a marinade (Likely white wine and fresh herbs with a hint of garlic and a touch of oil; or wine with garlic and ginger anda touch of oil), then marinate breast-side down, flat in a Zip-loc or glass dish, for 6-8 hours. Then I'd grill/roast, turning every 10 ikn orso and basting with the marinade, till done as above, about 35-40 min.
Just a couple thoughts.