How to expand a macro so that it can be used as an input to another macro

Question

I use datatool to get key-value pairs from a data file into a database. I then retrieve values using a custom command, \varConfig{}.

One of these values is the number 1, saved as a string in the data file.

My command \varConfig{} gives me the number "1" as a string if I use the command in the body of the document.

I want to use that number as an input to another command that generates the path to a file. At the moment I am hard coding it.

\input{\reviewfile{1}{conclusions.tex}}

But simply replacing the 1 with the \varConfig{} command, like this...

\input{\reviewfile{\varConfig{report-number}}{conclusions.tex}}

... gives me the error

illegal parameter number in definition of \reviewfle

How do I avoid this error? I'm guessing it is somehow related to expansion, but I have no idea how to use \expandafter appropriately in this case.

edit: I have tried the solutions at Pass the contents of an \input command to a macro, for example

\expandafter\input\expandafter{\reviewfile{\varConfig{report-number}}{conclusions.tex}}

but that just gives me more errors.

edit: MWE

\documentclass[9pt,notitlepage]{article}
\RequirePackage{datatool}
\DTLsetseparator{:}% Set the separator between the columns.
% import data from test.csv into a database called 'config'
\DTLloaddb[noheader, keys={key,value}]{config}{config.csv}
\newcommand{\varConfig}[1]{% 
\DTLgetvalueforkey{\scratchmacro}{value}{config}{key}{#1}%
\DTLifnull{\scratchmacro}{\textbf{ERROR!} key #1 is undefined.}{\scratchmacro}%
}%
% create new command
\newcommand{\reviewfile}[2]{#1/#2}
\begin{document}
\varConfig{block-text}
\begin{table}[!htbp]
    \caption{\protect\varConfig{short-text}}
    \begin{tabular}{lr}
        Name:         & \varConfig{block-text}                                \
    \end{tabular}
\end{table}
\varConfig{report-number}
\input{\reviewfile{1}{test.tex}}
%\input{\reviewfile{\varConfig{report-number}}{test.tex}}
\end{document}

the data in config.csv look like this:

short-text: "hello world" 
block-text: "this is some long text to see what happens"
report-number: 1

I then have the file 1/test.tex, which is a dummy file containing the text:

THIS IS A TEST

the output should look like this: