Wrong clef Transposition quandary

Dorico
1

I’ve imported an XML score, which has brought in a Tenor C clef staff as Alto C clef.

So the notes are a third too high, but the semitones are in the wrong place.

I’m presuming there’s a Shift I incantation that would work.

Any thoughts?

2

What about t-3?

Edit: After a few tests, t‑3 seems to work if you’re in C major/A minor. It gets more complicated if there are key signatures. So I’d suggest: remove the key signature or set everything to C major, apply t‑3, then restore the key signature. Even with quite a lot of accidentals it seems to work here…

3

Brilliant. Luckily it’s in C!

Thanks.