Clef change at the very beginning?

How can I insert a clef change in measure 1, bar 1?

I want a change (e.g. after the key and time signature), not to change the initial clef at the far left of the system.

Basically the case is where an instrument starts in a non-tradional clef (Think the Rite’s opening tenor clef Bassoon, or a piano work with both staves in bass clef) where you want to make the non-standard clef extra super obvious.

Custom text object, and remove collision avoidance?

You could also add a 16th note to that first measure (Shift-B, 1/16), start with a 16th rest, change the clef, and hide the rest. Might need to do some manual adjustment of spacing.