How to change the main font in ClassicThesis without altering anything else

I’m using ClassicThesis plus Arsclassica packages and I would like to change the main font with a standard computer modern and at the same time, I don’t want to change Headers style, Toc style or anything else. I have partially achieved this with the ClassicThesis option: palatino=false, but now the Toc font is switched in computer modern while I want the default style of Arsclassica. Any suggestion?

Here the code:

documentclass[a4paper,11pt,oneside,openright,titlepage,headinclude,
footinclude,BCOR5mm,numbers=noenddot,cleardoublepage=empty]{scrreprt} 
usepackage{subfig} 

usepackage[eulerchapternumbers,beramono,pdfspacing,palatino=false]{classicthesis} 
usepackage{arsclassica}

usepackage{lipsum}
usepackage[english,italian]{babel}
%usepackage{microtype} 
usepackage{afterpage}
usepackage{setspace}
usepackage[italian]{varioref}
usepackage{eurosym}
usepackage{quoting}
quotingsetup{font=small}
usepackage{indentfirst}
usepackage{enumerate}
usepackage{epigraph}
usepackage[output-decimal-marker={,}]{siunitx}
usepackage{booktabs,amsmath,eurosym,mathtools,amssymb,bm}
usepackage{array}
%usepackage{booktabs}
usepackage{graphicx}
usepackage{acronym}
usepackage{tabularx}
%usepackage{caption} 
captionsetup{tableposition=top,figureposition=bottom,font=small}
%usepackage{xcolor} 
usepackage{tikz}
usepackage{float}
%usepackage{subcaption}
usetikzlibrary{calc,matrix,patterns}
usepackage{pgfplots}
usepackage[autostyle,italian=guillemets]{csquotes}
usepackage{url}


renewbibmacro*{doi+eprint+url}{%
    printfield{doi}%
    newunitnewblock%
    iftoggle{bbx:eprint}{%
        usebibmacro{eprint}%
    }{}%
    newunitnewblock%
    iffieldundef{doi}{%
        usebibmacro{url+urldate}}%
    {}%
}


DeclareCiteCommand{citeyear}
{usebibmacro{prenote}}
{bibhyperref{printfield{year}}bibhyperref{printfield{extrayear}}}
{multicitedelim}
{usebibmacro{postnote}}

DeclareCiteCommand{citeyearpar}[mkbibparens]
{usebibmacro{prenote}}
{bibhyperref{printfield{year}}bibhyperref{printfield{extrayear}}}
{multicitedelim}
{usebibmacro{postnote}}


makeatletter
AtBeginDocument{%
renewcommand*{AC@hyperlink}[2]{%
    begingroup
    hypersetup{hidelinks}%
    hyperlink{#1}{#2}%
    endgroup
    }%
}
makeatother

date{}

begin{document}

tableofcontents

phantomsection
addcontentsline{toc}{chapter}{Introduction}    
chapter*{Introduzione}
lipsum
chapter{Dummy title 1}
lipsum
section{Dummy title 2}
lipsum
chapter{Dummy title 3}
lipsum
section{Dummy title 4}
lipsum

end{document}

Here what I obtain (please note Introduction and section titles are in cm font while chapter I think is the default iwona with euler numbers style):

Here what I want* (I think section titles and numbers are in palatino font while introduction is still in cm maybe because of addcontentsline; I can fix it with section[{fontfamily{ppl}selectfont Introduction}]{Introduction}):

Any help will be appreciated.