Would it be possible to make a firmware tweak to BIM that would allow a mode in which the delay would be mono with left in/out acting as normal, but the right in/out would act as an external effect loop for the delay signal? Similarly to what they have on Strymon Timeline (they call it the Feedback Loop) or Source Audio Nemesis (they call it the External Loop).
Timeline and Nemesis are a full digital DSP based unit, unlike BIM which is mostly an analog FX (the sound is converted in 12-bit only for the delay function, but input gain, compression, filters, feedback are full analog).
So we cannot modify the signal path with a firmware upgrade. It will need complex a hardware modification.
All the best,