You're not supposed to use kettlebells with "gradual weight increases".

That's not really how KBs are meant to be used.

Now, keep in mind, the original KBs weren't a fitness tool anyways. It was a farm tool for weighing grain, but then people started lifting them and it turned into a sport.

Anyways, you don't microload with KBs like you do with plates or dumbbells.

With a dumbbell you're strong enough to do .... say a set of 10 with 50 lbs. Then if you get a little bit stronger, you do a set of 10 with 55lbs.

With KBs you do a whole workout, or series of exercises, or at least a main two core KB exercises, with ONE size KB say... 20KG.

You do swings for example, and THIS week you can only do 15 swings at a time. You can only do 30 swings in 4 minutes. The swings feel very hard for you.

You keep working and the get easier. Soon you can do 4 minutes straight without a break. You can do swings with a double hand tap. You can do swings are a rate where the weight of the KB isn't keeping you from going faster.

At that you have "mastered" a 20KG kettlebell, and you are ready to "graduate" to a 24lb KG.

This is why many home gym users own multiple dumbbells, or adjustable DBs, but when they own KBs they will only own one or two