Hi Dan!
No problem. We have an article on Taproom & POS management in Breww which goes into this in some depth, so it would be well worth a read. Essentially we, in general, would still recommend selling it to the taproom and using service products to track individual sales. There are a couple of bits which are pretty relevant to your question in that article, but essentially the section on Handling served drinks (pints, wine by the glass, etc) explains how we recommend handling served drinks in Breww with POS.
If you choose to go about this by transferring keg stock between sites and creating draught products, you can do this, and there is a comment thread at the bottom of that article that goes through this setup. In terms of how you would go about moving stock, we again handily have an article on How do I move products to a different location? which should cover everything you need to know.
If you still have any questions, please let us know, and we will be more than happy to help.