R-Markdown pdfLatex won't work when rendering shape ="\U0001f693"

Question

This is my first time using r-markdown and running into problems rendering the symbol above. Everything else works great. It also works in r in ggplot2 but won't work in r-markdown. When I include "\usepackage[utf8x]{inputenc}" it renders but gives a document clash. I have seen solutions for using a different engine but I don't want to mess up my formatting. Anyone know a way to render the symbol without changing engines? Anyone know what packages are classing and how to rectify it? I have included all packages below.

Thanks.

  -\usepackage{geometry}
  - \usepackage[english]{babel}
  - \usepackage{natbib}
  - \usepackage{url}
  - \usepackage{amsmath}
  - \usepackage{graphicx}
  - \graphicspath{{S:/Analysis/ECAC/Mike_R/}}
  - \usepackage{parskip}
  - \usepackage{fancyhdr}
  - \usepackage{vmargin}
  - \usepackage{float}
  - \usepackage{caption,booktabs,array}
  - \usepackage[most]{tcolorbox}
  - \usepackage{lscape}
  - \usepackage{subcaption}
  - \newcommand{\rowgroup}[1]{\hspace{-1em}#1}
  - \setmarginsrb{3 cm}{2.5 cm}{3 cm}{2.5 cm}{1 cm}{1.5 cm}{1 cm}{1.5 cm}
  - \title{}
  - \author{}                               
  - \date{\today}                                   
  - \makeatletter
  - \let\thetitle\@title
  - \let\theauthor\@author
  - \let\thedate\@date
  - \makeatother
  - \pagestyle{fancy}
  - \fancyhf{}
  - \rhead{ECAC}
  - \lhead{\thetitle}
  - \cfoot{\thepage}
  - \captionsetup{font=Large}
  - \usepackage{hyperref}
  - \usepackage[utf8x]{inputenc}

Answer 1

If you used lualatex you could use a font covering this range, but with pdftex I'd use an image.

\documentclass{article}
\usepackage{graphicx}
\DeclareUnicodeCharacter{1F693}{\includegraphics[height=1em]{police.png}}

\begin{document}

U+1F693 is POLICE CAR: 🚓

\end{document}

where police.png is