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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.
Salsa have their own version, very expensive thought;
https://salsacycles.com/components/category/bags_frame_packs/exp_series_anything_cradle_35mm