Perfectly reasonable way to approach it if you ask me. There are many approaches to IF, and I think the most important thing about this lifestyle is to pick the approach that works for you and your life. I also wouldn’t call it a cheat, but a reward meal 😉
I’ve done IF for 4-5 years, the whole weekend is often a cheat meal if we’re really enjoying ourselves, and I rarely fluctuate more than 1lb over average on Monday morning. I just stay in the window of eating.
I have a cheat day every Saturday. I’ve been doing 16:8 since the last week of September and have lost about 5kg. I started at 66kg so I’m not extremely overweight. I think it’s been successful for me because I don’t think it’s sustainable without some flexibility.