One can also create small binaries with https://github.com/sunfishcode/origin (e.g., https://github.com/sunfishcode/origin/blob/main/example-crat... is in that ~400 bytes range) and select features as wanted without having to reimplement everything. Also see https://github.com/sunfishcode/origin-studio and https://github.com/sunfishcode/mustang - and of course https://github.com/sunfishcode/eyra