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Your best option for small proportions: Sriracha Sauce

Incorporate this with a 1:1 Cajun spice to smoked paprika ratio (more if your bottle at home is milder or less if it’s spicier). 

Having said this, something as beneficial as capsaicin does not come without any trade-offs. Producing capsaicin takes a lot of energy, which is why some peppers are not spicy. In some cases it makes more sense to make a lot of fruit with less or no capsaicin, thus producing more seed, and getting offspring by overwhelming predators and plagues by sheer volume.