@InvisibleLandscape , if you click the lock icon in the top control bar, it lets you click a chord to preview without adding. May first have to show the lock control in Preferences → App Preferences → Show Lock Control
I started using the lock control which is useful, however it’s location isn’t very convenient compared the chord location which means a lot of mouse movement turning it on/off each time. Having it with the chords would be easier.
A keyboard shortcut to toggle lock or modifier+click to override the status could work almost as well as the suggestion above (i.e. if unlocked shift+click previews without inserting, and if locked shift+click inserts.)