The KPA won’t get alternate tuning feature anytime soon. But a Roland or Boss GK device can do the trick.
A Roland VG-99 will do this easily and accurately. And much, much more. You can dial up any alternate tuning you want.
I suggest the VG-99 because a used one is a relatively inexpensive choice compared to a Boss SY-1000. But VG-99 still has great sound quality and even some features not on the SY-1000. The Boss does work in a limited way with a mono input from a standard magnetic pickup. I’m not sure if the pitch shifting feature works with the mono input though.
Yes, the VG-99 requires a hex pickup. I have a Brian Moore i213 which has a built in RMC hex piezo. I also have an external GK-3 on my Hamer Duotone. It will soon be replaced with a Cycfi Nu2.
I feed my unpowered KPA with a mono signal from my VG-99 for alt tunings all the time. The GR-300 built in is a really accurate model. Wanna sound just like Pat Matheney? Here you go…
There is no noticeable latency, And there are all kinds of HRM sounds that add synth like tones to your guitar. It is really easy to create instant 12 string guitars, too.
I plan on adding a Stage soon to my Kemper rig. The VG-99 can output a stereo signal. So I can feed each KPA its own signal. That will be really cool.