Salsa have their own version, very expensive though
That Salsa Anything Cradle looks very stable and narrow enough not to interfere with brake levers/hand position on drop handlebars. However, it only comes ready to fit 35mm diameter handlebars, and 31.8mm via the included shims. My handlebars are 25.4mm diameter so a pair of unusual 25.4 to 35mm shims would be needed. I'll look into the issues involved further.
That Salsa Anything Cradle looks very stable and narrow enough not to interfere with brake levers/hand position on drop handlebars. However, it only comes ready to fit 35mm diameter handlebars, and 31.8mm via the included shims. My handlebars are 25.4mm diameter so a pair of unusual 25.4 to 35mm shims would be needed. I'll look into the issues involved further.