Wouldn't worry about the Coke too much. More for marinades. Bit of Worcestershire and balsamic vinegar with some crushed birds eye chili and salt for overnight brining also does the trick, along with the other ingredients you listed rubbed on and then layered for a few hours to allow the flavour to get in there before hanging to dry.Loadsa sh1t in that mix... all you should need is brown sugar, coarse salt, coriander seeds, black pepper and vinegar. You can use Coke (I would advise against South American marching powders) as well.
What is more important is that you dry it properly. In Pomland it's harder than in Seffrica due to the temperature and humidity.
Cold temps are OK but humidity can be a problem, hence keeping a careful eye on things in summer on the highveld. Best solution is constant airflow. Helps to dry it and keeps the flies off. Decent fan will do the trick, along with a well ventilated room.