Tentativi ulteriori:
1.
`%\AtEveryCite{
\DeclareNameFormat{scdefault}{%
\renewcommand{\mkbibnamefirst}{\textlcsc}%
\renewcommand{\mkbibnamelast}{\textlcsc}%
\renewcommand{\mkbibnameprefix}{\textlcsc}%
\renewcommand{\mkbibnameaffix}{\textlcsc}%
\ifcase\value{uniquename}%
\usebibmacro{name:last}{#1}{#3}{#5}{#7}%
\or
\ifuseprefix
{\usebibmacro{name:first-last}{#1}{#4}{#5}{#8}}%
{\usebibmacro{name:first-last}{#1}{#4}{#6}{#8}}%
\or
\usebibmacro{name:first-last}{#1}{#3}{#5}{#7}%
\fi
\usebibmacro{name:andothers}}}`
ottengo il maiuscoletto, ma perdo il nome: resta solo il cognome.
2.
`\DeclareNameFormat{scdefault}{%
\renewcommand{\mkbibnamefirst}{\textlcsc}%
\renewcommand{\mkbibnamelast}{\textlcsc}%
\renewcommand{\mkbibnameprefix}{\textlcsc}%
\renewcommand{\mkbibnameaffix}{\textlcsc}%
\iffirstinits
{\usebibmacro{name:first-last}{#1}{#4}{#5}{#7}}%
{\usebibmacro{name:first-last}{#1}{#3}{#5}{#7}}%
\usebibmacro{name:andothers}}
\newbibmacro*{cite:opcit}{%
\printtext[bibhyperlink]{\bibstring[\mkibid]{opcit}}}`
alla prima occorrenza sembra andare tutto bene,
ma alla seconda ecco che le iniziali tornano in maiuscolo 🙁