Did a little research, and apparently I can bypass the IMA and keep the DC-DC converter just by unplugging the BCM and leaving the battery installed.
Link for reference:
Honda Insight (2000-2006) - Battery Bypass Instructions
Will this still keep the 12V charged? It sounds like it should per research in Insight Central..
Also, will the CEL and IMA lights still be on with the bypass? I was still getting lean burn with the IMA/CEL lights on today. Lean burn is a non-negotiable must have. Having the IMA/CEL lights off is a bonus. If lean burn won't work with the bypass then I'll have to see if I can shut the lights off by spoofing something.
Ecky you said you lost lean burn with your bypass? How and why? Did you ever get it back?
Going to try the bypass tomorrow..