Sinks tend to be slightly bigger so you can actually get a plate in them. That sink details here the bowl is only 23cm wide (nine inches!). Isn't there some ergonomic thing with getting both hands in to wash up or fitting a washing up bowl in.
Is it because you have a small base unit under? You can often cut a bit out of the unit sides to squeeze in a larger bowl.
Simple human do worktop drainers - this is a good one but takes up quite a bit of space.
Ikea are good for unusual and small sinks - this or this or this any good?