Your best option for small proportions: Sriracha Sauce
Crushed red pepper flakes are basically just dried peppers that are not ground to powdered form. Because it has not been ground further, it will leave you a mix of seeds and pepper flakes. This condiment is often used to garnish pizza, soups, and stews to add a layer of spicy flavor. That said, it might not be a good backup for some recipes because of its coarse texture. The good thing is you can always use your handy spice grinder to ground it into powdered form.
Be sure to finely mince your garlic and grate your ginger (keep them separate)