[Tex/LaTex] Need itemize list items without using a list

Question

For reasons too complicated to go into here, I need the ability to create something that looks like a list item without using a list. Specifically, I want each item to begin with a mark (which is a triangleleft, but that doesn't matter), and the text, if it wraps multiple lines, to wrap and indent just as a list item should. [Edit: I actually need these ersatz items to be standalone – that is, not inside any kind of enclosing structure like a table that requires an opening token and a closing token].

From reading other notes, I gather I can do this using a minipage to indent the text. Is there an easier way without loading additional packages? Thanks.

[Edit: it appears that there is some doubt that this is really what I need. The requirements are laid out in more detail here. Bottom line: I have to put text inside another .tex file which, when processed, will create a tex file that I can process with a different set of macros to create my output. Thus the single tex file produces two PDFs eventually: the one generated by the file itself and the one generated by my generated tex file. The issue is that while I theoretically could use a list structure to hold the solutions that I'm writing, that requires a pretty complex set of boolean flags to put list ending code in the right place, and that is all pretty brittle. So I'd prefer a solution in which each solution stands alone.]

Answer 1

This may be what you want, with help from @ChristianR and from
change the itemize from bullet to square

 \documentclass{article}

\newenvironment{notalistitem}
{\begin{itemize}
\renewcommand{\labelitemi}{$\triangleright$} 
\item}
{\end{itemize}}

\begin{document}

Some text

\begin{notalistitem}
Here is text that should look like a list item although it doesn't
seem to be part of a list.
\end{notalistitem}

\begin{itemize}
\item This is part of a list.
\end{itemize}

\end{document}

Edit: You'll need something more robust if you want to use an itemize inside this new environment, or one of these inside an itemize.