Use document title in header defined in template with KOMA class

I’m writing a document template as a .tex file, that can simply be included at the beginning of any new document and loads all packages, defines headers, footers etc. called my_template.tex.

Inside my_template.tex, I use KOMA-Script to style the header like:

documentclass[
    11pt,
    a4paper,
]{scrarticle}

usepackage[page]{totalcount}
usepackage{scrlayer-scrpage}
setkomafont{pagehead}{normalfont}
ohead{Template Name  Document Name small Page thepage~of totalpages}
cfoot{}
setlength{headheight}{14pt}

I want the user to be able to set the title somewhere inside the document, but use this definition inside the template. Something like:

input{my_template.tex}
...
begin{document}
...
title{My Document Title}
...
end{document}

How can I set the Document Name inside the header to be My Document Title? I would also like the same title for a maketitle command.

documentclass[
    11pt,
    a4paper,
    head lines=3
]{scrartcl}

usepackage[page]{totalcount}
usepackage{scrlayer-scrpage}
setkomafont{pagehead}{normalfont}
clearmainofpairofpagestyles
ohead{%
  Template Name%
  Ifstr{documentname}{}{}{documentname}%
  small Page thepage~of totalpages
}
newcommand*documentname{}

letoriginaltitletitle
renewcommand*title[1]{defdocumentname{#1}originaltitle{#1}}

usepackage{blindtext}% only for dummy text
begin{document}
title{My title}
author{Author}
maketitle
blinddocument
end{document}