Since the Kroma R doesn't seem to be available yet locally, you could always get the Zlide or Zenith tank separately and pick a different mod. I'm guessing (and please correct me if I'm wrong) you prefer the R because it uses an 18650. The Aegis Solo is probably the most popular single battery mod at the moment. If you're interested in other options, just let us know what you want in a mod and someone around here will come up with something to suit you.
If you'd rather wait, I expect the Kroma R will turn up eventually. I just don't know whether eventually is tomorrow, next month or next year. It's a bit hard to tell with products coming from China in the coronavirus era.