The “invisible clef” is actually an invisible treble clef. I made a doricolib file to add an invisible bass clef and posted it here. Of course, you’ll then have the issue that you’ll need to add a real bass clef on the next system, and Dorico won’t let you hide the cautionary clef, so you’ll have to start a new flow or use a coda. (The ability to hide cautionary clefs has been requested a bajillion times.)
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