I haven't been very active on this forum... but I did make a DIY stereo MOD for the powered rack and head that I sell on my website. https://withanell.com/store/kemper
I also have it available on Reverb.com at https://reverb.grsm.io/withanellMOD
I kept it solderless...because of this it does require you to drill 2 holes and there is an external y cable. The cool biproduct of that is you get access to both channels of the amplifier and can actually use it to amplifier other fx if needed.
If you aren't afraid to take apart the Kemper, it is a relatively easy MOD. I've sold a bit under 100 units so far and haven't ran into any problems with installation.