If you can make homemade corn syrup, you can make homemade marshmallows. If you can make homemade marshmallows, you can make homemade Lucky Charms marshmallows. If you can do that, you are become death, destroyer of worlds.
That said, making homemade Lucky Charms is not for everyone.
You can read that sentence as a warning or as a challenge to be one of the few who are up to the task. I will never make them again. That's not because they turned out poorly. No, quite the opposite - they were amazing! However, homemade Lucky Charms were so labor-intensive that both Jonathan and I are still recovering - we have blisters on our thumbs from continuous pressing on cookie cutters (Jonathan had to take over after my fingers hurt so much that I couldn't cut anymore).