Another option: create an embedded search for “#idea” or something similar on your daily note template. Then, add that tag to any line. The embedded search will show the new result immediately.
Since Obsidian searches support regex queries, you can pick up entire lines following the above approach with this query… (I think.)
/.*(#idea).*/
Another route is the Workbench plugin. You can set a specific note as a Workbench, then it offers a variety of ways of adding content to that destination. (Workbench’s developer’s the worst, though.)