Wie überrede ich LYX dazu meinen selbst kreierten Font zu finden?

#LyX 2.1 created this file. For more info see http://www.lyx.org/
\lyxformat 474
\begin_document
\begin_header
\textclass scrbook
\begin_preamble

\usepackage{mathptmx}

\DeclareFontFamily{U}{jksymbols}{}
\DeclareFontShape{U}{jksymbols}{m}{n}{<->jksymbols10}{}
\DeclareSymbolFont{myletters}{U}{jksymbols}{m}{n}
\DeclareMathAccent{\myvec}{\mathord}{myletters}{"41}
\end_preamble
\use_default_options true
\maintain_unincluded_children false
\language ngerman
\language_package none
\inputencoding auto
\fontencoding global
\font_roman default
\font_sans default
\font_typewriter default
\font_math auto
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize 10
\spacing single
\use_hyperref false
\pdf_title "Template"
\pdf_bookmarks true
\pdf_bookmarksnumbered true
\pdf_bookmarksopen true
\pdf_bookmarksopenlevel 1
\pdf_breaklinks false
\pdf_pdfborder false
\pdf_colorlinks true
\pdf_backref false
\pdf_pdfusetitle true
\pdf_quoted_options "linkcolor=red, citecolor=black, urlcolor=blue, filecolor=blue,  pdfpagelayout=OneColumn, pdfnewwindow=true,  pdfstartview=XYZ, plainpages=false, pdfpagelabels"
\papersize default
\use_geometry false
\use_package amsmath 2
\use_package amssymb 1
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\leftmargin 2cm
\rightmargin 4.5cm
\secnumdepth 2
\tocdepth 2
\paragraph_separation indent
\paragraph_indentation default
\quotes_language german
\papercolumns 1
\papersides 2
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Standard
Original:
\begin_inset Formula $\vec{A}\vec{e}_{1}^{\prime}\dot{\vec{e}}_{2}^{\prime}$
\end_inset

\end_layout

\begin_layout Standard
Meine Version:
\begin_inset Formula $\myvec{A}\myvec{e}_{1}^{\prime}\dot{\myvec{e}}_{2}^{\prime}$
\end_inset

\end_layout

\end_body
\end_document