I only need to change the formatting in the bibliography list, the formatting of the notes in the text is entirely up to the requirement.
A strange effect (full MWE in attachment):
\btxdoifelse {address} {
{\btxspace \emdash \btxspace \btxflush{address} \btxcomma}
}
\btxdoifelse {year} {
{\btxspace \btxflush{year} \btxperiod}
}
gives "year 2000", but throw out the "address" part, and the year goes straight without the 'year' part.
\btxdoifelse {year} {
{\btxspace \btxflush{year} \btxperiod}
}