Eb capo ?
 

I just noticed there are Kyser capos that can transpose into dropped D or DADGAG, firsty had no idea that was possible.

However is there such a capo or device that can have an Eb or half step down Capo ?

Or in other words is there a way to play half a step down without going through the physical detuning ?

Would be great at gigs where we dont want to spend time detuning .

I have done this: Tune down, play with capo on 1st fret and removed capo on songs where I needed half step down. It was useful for vocals on some tunes. But, probably not what you had in mind