I love the flavors of hot peppers. Unfortunately or fortunately you can't get one without the other. scraping out the seeds and white veins will get some of the hot. There is list a mile long of all the different peppers.
Growing hot peppers and Bel peppers near each other will boost the heat and flavors of Bell peppers. I don't know enough about pollination and crossing peppers to discuss it.
Dad grew some little red pepper similar to Jalepenos that had a great flavor but were hot. don't know their name.
I remember the first and some other times picking baskets of them and weaving the stems and hanging them. touched my eyes even after washing and some, of my favorite parts and burned for days. Can't wash the stuff out of your skin.
I would love to have some chili without the bitter spices and weird spices originally used to keep bugs off, and lots of beef and those flavorful and hot, but not too hot peppers again.