The only issue I can see with that is you'll have little use for
it when you move onto bigger weights, except for warm-ups and
perhaps for your other half. Someone should've made stackable
kettlebells.
There are adjustable-weight kettlebells, but they're expensive
as hell and hard to come by in Singapore. And importing it is of
course out of the question.
Looking at my puny frame, I'm going to be stuck at 12 kilos for
a while anyway.
Besides, the kettlebell pros say that even if you outgrow one
weight, you can simply compensate by doing more reps.