We're not discussing about addition of characters standardized by joint efforts of Unicode's UTC and ISO's WG2, and I'm not expecting a lot of changes in this area. But about a more general scheme in which the Unicode/ISO10646 would become a part of a larger set of standards for encoding something else than just pure text.
I wasn't aware that you were desinging an unrelated standard. What you describe in your message, and which I am not repeating here is not Unicode.
When you design your own standard, you don't need to worry about features of Unicode, such as UTF-16.
A./
