This pedal builder creates loopers and a pedal re-sequencing device (see the “flip flop”), and is also very open to discussing mod ideas. You might want to jot down your idea and reach out to him, he’s a great guy.
Have you tried another Micro POG and had the same result?
I’ve had mine a couple of years, and have never experienced what you describe, and I run a fairly big board (12+/- pedals and a small mixing board) I’ve even put the pedal on a mixer fx loop where several channels were sending signal to it simultaneously, with no hiss (at least none that couldn’t be accounted for from some other source:) ).