Not using makeup the way it says on the packaging is common, because people have been using bronzer as eyeshadows for years. Also, a monochromatic look, where your lips match your cheeks, is highly flattering, and it can be achieved with just one makeup product (via Refinery29).
Topshop beauty consultant Hannah Murray recommends using lipsticks that are a bit sheer (and not too matte), like the Clinique Chubby Stick if you are going for a natural flushed look. If the lipstick is too dark, you can also mix it with Vaseline to make it sheerer and lighter (via Vogue). Refinery29 recommends trying the Josie Maran Argan Color Stick because it's an effortless way to add a rosy glow to your lips and your cheeks. These color sticks are also infused with apricot and mango seed butter and available in six gorgeous shades.
Project Vanity loves using the Maybelline Color Sensational Creamy Matte Lipstick as a blush as well because they are highly pigmented and infused with caring oil that makes it easy to glide on your cheeks. If you have a super dark lipstick, blend in some foundation or mix it with moisturizer to soften the color. Insider says to blend the lipstick as a blush, dab a little color on your cheeks based on the shape of your face and use your fingers for a more precise application or a brush for blending.