Python solution, with larger tip

\pgfarrowsdeclare{anglelatex'}{anglelatex'}
{
  \newdimen\len
  \len=\pgfgetarrowoptions{anglelatex'}
  \pgfarrowsleftextend{-0.136122\len}
  \pgfarrowsrightextend{0.6\len}
}
{
  \newdimen\len
  \len=\pgfgetarrowoptions{anglelatex'}
  \pgfpathmoveto{\pgfqpoint{0.6\len}{0\len}}
  \pgfpathcurveto
  {\pgfqpoint{0.340192\len}{-0.0816987\len}}
  {\pgfqpoint{-0.136122\len}{-0.220096\len}}
  {\pgfqpoint{-0.590785\len}{-0.17524\len}}
  \pgfpathcurveto
  {\pgfqpoint{-0.136122\len}{-0.288397\len}}
  {\pgfqpoint{0.0370835\len}{-0.461603\len}}
  {\pgfqpoint{0.0587341\len}{-0.82476\len}}
  \pgfpathcurveto
  {\pgfqpoint{0.123686\len}{-0.479904\len}}
  {\pgfqpoint{0.426795\len}{-0.168301\len}}
  {\pgfqpoint{0.6\len}{0\len}}
  \pgfusepathqfill
}
\pgfsetarrowoptions{anglelatex'}{8pt}
\pgfkeys{/tiplen/.default=8pt, /tiplen/.code={\pgfsetarrowoptions{anglelatex'}{#1}}}