I have a brand new Payne Labs K-Switch that I'll sell you for $120 + $10 shipping to the US.
It works very well, but I needed more loops so I got a GCX.
It has 4 relay functions that can do momentary or latching switching & 4 true bypass (relay, not FET) loops.
Let me know if you're interested. I can send you some pics tonight after work.
Andy
808-633 three nine four four