Just created Sage Native Block Acorn Package. That could perhaps help you and others setting up multiple blocks in Sage.
It is in beta, but works quite well to add a basic native block setup in a Sage (based) theme. It is an Acorn package. The command wp acorn sage-native-block:add-setup my-cool-block or wp acorn sage-native-block:add-setup vendor/my-cool-block work well and sets up
resources/js/blocks/my-cool-block/
├── block.json
├── editor.css
├── editor.jsx
├── index.js
├── save.jsx
├── style.css
└── view.js
with a basic block.json, basic CSS style.css and editor.css rules using set class name (based on block name and vendor name as well as a basic editor.jsx and save.jsx to get you going.
The package adds block types registration to setup.php as well as includes blocks their index.js to editor.js Open to pull requests for improvements.