Cfrgtkky

I am trying to create a table like this one here:

The problem I have is that it requires a lot of finite tuning for each cell to be centered, and I'm planning to add more rows for different kanji symbols (which may have more subrows for each (K) and (O) row.
Is there a way to configure the alignment programatically?

Here is the code for the table I showed (must be compiled with XeLaTeX compiler):

documentclass[12pt]{article}

usepackage{xeCJK}

usepackage{ruby}

usepackage{multicol}

usepackage{multirow}

usepackage{array}



renewcommand{rubysep}{-4ex}

newcommand{mr}[2]{multirow[c]{#1}{*}{#2}}

newcommandBstrut{rule[-2.5ex]{0pt}{0pt}}

newcolumntype{M}[1]{>{centeringarraybackslash}m{#1}}

% I added more height to the cells to allow the japanese characters to have space for the text below them 

renewcommand{arraystretch}{2}

pagestyle{empty}

begin{document}

begin{table}[!ht]



hspace{-2cm}begin{tabular}{|M{1.5cm}|m{3cm}|M{2cm}|M{2.8cm}|M{3cm}|M{2.8cm}|}

    hline

    % The multicolumn commands used here are needed to align vertically the cells

    multicolumn{1}{|c|}{漢字}  & multicolumn{1}{c|}{Explicación} & multicolumn{2}{c|}{くんよみ(K)•おんよみ(O)} & multicolumn{1}{c|}{Palabras} & multicolumn{1}{c|}{Significado}\

    hline

    hline

    multirow[c]{7}{*}{人} & multirow[c]{7}{3cm}[0.2pt]{Persona. newline Indica el lugar de procedencia de la persona. newline Contador de personas.} & K & ひと  & ruby{人}{ひと}Bstrut & Persona\

    cline{3-6}

    & & multirow{3}{*}[0.2cm]{O} & ジン & アルゼンチンruby{人}{じん}Bstrut & Argentino\

    cline{4-6}

    & & & ニン & ruby{三}{３}ruby{人}{にん} & Contador: Tres personas\

    cline{3-6}

    & & multicolumn{2}{c|}{multirow{3}{*}{Excepciones}} & ruby{一人}{ひとり} & Contador: Una persona\

    cline{5-6}

    & & multicolumn{2}{c|}{} & ruby{二人}{ふたり} & Contador: Dos personas\

    hline

end{tabular}

end{table}

end{document}