There are all kinds of cabinet construction out there, and without photos of your sink cabinet this is just a shot in the dark. But using mine as an example, I think it would be quite easy to add a toe-kick in front of the sink. I would cut out the horizontal board below the sink cabinet door. There is an inner shelf at about the same level as the top of that horizontal board. I would take that same board, or probably a different one, and move it inward about 2", and screw through the lower shelf into that board. Cap the ends off with a couple of short pieces. If there are screws into the floor, it won't be difficult to disguise those. I might choose to raise the door by a half inch or so, but probably not. A standard toe-kick is 3" high, and I don't think the bottom of that door is 3" from the floor, but probably not a big deal. An easy alteration if it was.
The female anatomy puts the toes further forward than a male. As I worked at the sink boning chicken at home last night, I thought of this thread and paid attention to where my toes felt comfortable. I was never close enough for my toes to be into the toe-kick. I am NOT going to bring this up to the wife, but I will have to watch and see how different her footwork looks.
Our trailer and our home both have corner sinks, coincidentally.
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