We do Turducken in a similar fashion...yeah , I know, a Canadian making Turducken? YUP! You must remember to check the temperature of the turkey with an accurate reading meat thermometer though to ensure you've reached the bacteria killing temperature needed . This method works a treat!
I tried this at Thanksgiving and it was great. I did inject the turkey with cajun butter, put onions inside and rub the outside with cajun seasonings. It was nice and brown when we woke and the oven was free to do the rest of the cooking! On Christmas I will put the turkey either into a crockpot or electric roaster oven in the morning to keep it warm until lunch.