My answer is the same for a beginner. Most of my clients are brand new to training, and that is how I train them.Thanks, but I'm asking from the perspective of a beginner. If 28kg were my working weight, I wouldn't mind spending 13 weeks with it to get to 32kg. But my current working weight for RoP based on RM would be 16kg, and my half-bodyweight press would be 48kg. I have a loooong way to go compared to smaller people who would target 32-36kg. I'm 6'6" and broad (would easily weigh 200 pounds at absolute leanest); I think there's an opportunity to quickly establish 24-28kg as working weight prior to diving into 13-week cycles. If I just did RoP starting at 16kg, it would take 6-9 months to reach 24-28kg.
If you're doing 16kg and it is getting easy, cut the rest. As long as you aren't sacrificing rep quality, that's an excellent way to train. I can do the ROP ladders with a 24kg using a 1:1 work:rest ratio and get an excellent session in, despite most of my working presses being 32kg or 36kg.
If you're dead set on using heavier weights, and you are doing ROP and it is easy, then progress faster OR retest at the next bell and if you get 8-10, restart ROP with the heavier bell.
Alternatively, replace your singles with 16kg in a ladder with singles with a 20kg IF you can press the 20kg with a good single. So a ladder would look like 20kg x 1, 16kg x 2, 16kg x 3, etc.... When 20kg x 1 is super easy, replace the first two rungs. This way you can work in a heavier bell while building volume with a lighter bell.
If you don't have a 20kg, or you can't press a 20kg, or you have but can't press a 24kg then the whole question is moot. Just build volume with 16kg.
Don't be in a rush. If it takes a year to "own" the 28kg, and another year to own the 32kg and the 36kg, cool. If that takes 3 years, cool. Shoot it could take 5 years or 10 years - it doesn't matter. If you're training and finding ways to progress, you're getting stronger.