|> Is this a valid approach?
as already said it will be valid for a small, not often changed project. But since Perl 5.26 at least you can indent your heredocs: see Indented_Here-documents in perldelta.
A template system is something good to have in your bag of tools: recently in an interesting, similar thread Text::Xslate was suggested as terribly fast compared to the classical Template::Toolkit see Best way to start a perl project
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
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