Vocal part in transposing instrumental part

hi there - I have a can of worms question –
I’m writing a part for a B-flat clarinet – but in one part of the piece, I need the clarinettist to sing something as an ossia – so I made an ossia staff with a vocal line, but —

while the B-flat clarinet is a transposing instrument, the voice is not.
How can I make the Ossia “in concert” and the clarinet in B flat?

thank you so much!

This was discussed here back in April. Better to stay in B-flat and give the player a “transposing” voice part, because otherwise they have to switch keys mentally.

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thank you for sharing this, Mark, great to hear this consensus!