I have cooked many thousands of pounds of rice. Mostly the same way every time.
Very different cooking for myself and cooking for 1500 of my closest friends. LOL!
I'm still going to look for one that handles warming all day without burning the rice or making it inedible.
I may wind up giving this as a gift. ;)
/johnny
I googled “rice cooker keep warm” and there are a few after you click on shopping. Maybe one of them is what you are looking for.