Here’s a mod for the old style Bass Micro Synth for true bypass. I assume it works just fine for the guitar synth as well.
This is a drawing another forum user at Talkbass made, and my pedal tech used it accordingly, however there’s a mistake we discovered.

Now, where it says “discard” on that brown wire, DON’T DO THAT! Instead, make that wire connect on the switch where the green wire is connected in the diagram. Then, discard the green wire.
This is just what he’s told me, I can get more detailed instructions if necessary. Basically just rewire the switch for how it is there, with those 2 wires switched up.