>>>>> "Brian" == granam  <granam@xxxxxxx> writes:

    Brian> Greetings.  I'm curious if it is possible to use a
    Brian> character map to map double-byte characters.

Do you mean surrogate code points? You shouldn't use them. Use the
proper code point in the supplementary planes.

    Brian> the output Unicode is UTF-8 and would require no further
    Brian> processing.

It doesn't matter what the encoding is. You just specify the Unicode
code points you want, and the serializer will translate to the correct
byte sequence for the encoding.
-- 
Colin Adams
Preston Lancashire