This is very good intuition, and you might even argue the grammar is good, but at best it's unnatural. I rarely see any with the four versions mentioned in the initial post. All four of such variants are acceptable. One could argue that they are extra correct than "Sincerely yours". https://petskyonline-onlinestrore.blogspot.com/2025/07/top-10-aquarium-essentials-for-new-fish.html