I know nothing about coffee suppositories. But in regards to time constraint you mention I am wondering why taking a suppository is that much faster that taking a 2 cup coffee enema.
What I do is to prepare 2 or 4 quarts of coffee according to the recipe in my blog “My challenge” and refrigerate it for use within one weeks time. I take 2 cups of this coffee, warm it in a stainless steel pan to the desired temp. use a 1 cup bulb syringe, fill it, inject it into my rectum and the refill the syringe again to get the 2 cup enema. I retain it for 15 minutes and voila I’m done. Takes less than 45 minutes.
Keep the unused portion of the coffee in a tighly closed jar and in the refrigerator. It will keep for a whole week. I usually do these enemas daily for 1 to 2 weeks every 2 or 3 months. If time permits I do 2 of these 2 cups enemas for a better result.