Old style numeral labels and body text

Old style numeral labels and body text

Here's what I want to achieve with BibLaTeX:
The label and in the text, the year (four digits) in old style figures and
everything in \small
Prenote (see ~), if any, in \small
Post Note, if any, the abbreviation p in \small, the page number in old
style figures and also in \small
minimal example:
\documentclass[11pt]{scrreprt}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@Book{alexander:1964,
Author = {C. Alexander},
Title = {{Notes on the Syntheses of Form}},
Publisher = {Harverd University Press},
Year = {1964},
Address = {Cambridge Massachusetts London},
Edition = {7},
Series = {},
Keywords = {Literatur},
Label = {\textsc{\small{Alexander}} 19}}
@Manual{din66253:1989,
Title = {{{\small\textsc{\itshape DIN}~66\,253-3:}
Programmiersprache {\small\textsc{\itshape PEARL}}~--~Teil 3: {\small
Mehr\-rechner-\textsc{\itshape PEARL}}}},
Organization = {Deutsches Institut f{\"u}r Normung},
Year = {1989},
Keywords = {Normen},
Label =
\end{filecontents}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage[babel]{csquotes}
\usepackage[backend=biber,
style=alphabetic,
natbib=true,
sorting=anyt,
maxbibnames=10,
maxcitenames=2]{biblatex}
\bibliography{\jobname}
\begin{document}
\citep[][S.~1234]{alexander:1964}, \citep[][]{din66253:1989}
\printbibliography
\end{document}