I use a home built short capo for a few tunes. I just cut an 1/2 inch or so off a regular kyser. It enables me to get to an alternate tuning, w/o actually retuning and some chords are fretted the same. I also use a drop d tuning with the short capo on a few tunes. This gives you a modified double drop D, but again, the finger patterns stay the same.
I've said more than once, this is trickery and deception trying to mask my lack of ability.