As long as you keep the keg in the fridge, I don't see any issue. Also I would cold crash for a full 24 hours before adding the cranberries to avoid further fermentation.
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
If you've ever seen a fridge and a digital johnson controls controller then you know exactly what my system looks like.
I've never bothered with heating to 170° but you can if you want.