If you can find a southpaw WindX, that might meet your requirements. Unfortunately only the right hand version seems to be in stock, so you would have to check aftermarket.

I just took a Sol 3 to New York for a week. Traveled in its case in my carryon.

Caps Lock is a dead key in such an important position. I personally remap it to Backspace on tap and layer on hold (though many people do Control for HHKB).

I have arrow keys under my left hand on that layer, so if I need to quickly move in an editor, instead of moving my right hand to arrow keys, it’s just hold a key and tap.