Whats a ROM that i can flash via ODIN and not trip KNOX?

hello guys! i've been out of the rooting game for a while so i'm kind of lost. My mom has this phone, and we just moved. i want to get the wifi tethering mod on her phone so she can use her ipad and stuff. she's not really good with tech so i want a ROM that looks like 5.0.1 so she wont get confused with a new UI. I dont want to trip KNOX, so there a rom that looks or is like 5.0.1 (doesnt have to be that exact version) that i can flash via odin? i know i sound stupid but its been a while. thank you very much