I will assume the author is mostly casually using this layout, or at least not writing code with it. Having esc, tab, options, and os key on a layer even with osm is a nightmare (at least for me). I’ve been using a 42 key split ortho for the past 3 years now and whenever I’ve tried to reduce the number of keys I’ve failed miserably. Let’s see if 2022 is the magic year. Will give this layout a shot. Wish me luck.