We’ve had this Potassium salt substitute available for many decades. Morton’s salt has one available. And there was brand called No-Salt at least as far back as the 1970s.
I am not sure, though, how much can be used especially for some people with existing conditions. Some people with CV disease are advised to watch their potassium intake. Me, for one. I get plenty potassium from Bananas and Avocados and carrots and leafy greens. Not sure how much is too much. Was on an RX Potassium tablet for 30 days after a heart attack but the doctor was clear that once my levels returned to normal to stop taking them.
Decades ago, my dad had a heart attack and was advised to get more potassium. He began eating bananas.