(shameless plug alert) I wrote a super-simple Makefile script for using Pandoc, called acadoc . It lets you call "make beamer", "make manuscript", "make html_presentation", etc., in a directory with Markdown files to turn them all into whatever presentation/manuscript/paper/etc. you want. The key thing, though, is that for LaTeX presentations/etc. it uses an intermediary "style/manuscript.tex" file to customize how you want your resulting LaTeX to look -- so if you want the same content, but decide the presentation looks better with white-on-black instead of black-on-white, you only need make a few changes and create a "style/manuscript_dark.tex", copy-paste that style in the Makefile, and now you can call "make manuscript_dark". It's meant to be quick and easy to use, and theoretically easy to add new recipes to.
If you want some more serious power about multiple document-type exporting, check out the links in the Acknowledgements section of Acadoc, shown here:
(Yes, I know LaTeX styles/stylesheets are a thing, but I've never taken the time to learn them, nor figure out if they can do all the custom formatting a regular .tex stylization file can do.)