Originally Posted by tFUnK

Have thought about heat but not tried. Do not have a heat gun but can borrow one if I do go that route. It's a carbon frame and the BB appears to be aluminum alloy. I haven't done research yet into whether carbon can be heated, or if heat expansion of the alloy BB can crack the BB shell (eg, the bearing shelf under the cups).

The sawzall should work but it's a tight space and the BB shell has a shelf for press fit bearings to seat against so I'm not sure how I can get a clean cut without cutting into the frame. I suppose so I need to do is cut through the barrel section of the BB and not worry about cutting through the cups? Would I cut only the male barrel or both the male (DS) and female (NDS) barrels? I don't have a saw or a fixture so I'd need to take it somewhere to do that.

Think I'm going to try a pipe wrench while clamping the tool in place, followed by an internal pipe wrench if that doesn't work, before attempting heat or saw-based methods. I don't have any of these tools currently so the pipe wrenches are cheaper plus I can use them around the house. I can borrow a heat gun. But I really don't want to buy a sawzall just for this so I would need to ask around to see who might have one - I live in a condo so the other challenge is I don't have a bench or workspace - limited to a pretty basic bike stand as my "fixture".

So for some of the suggested methods I'm going to take it to a shop to have them do it. I already went to one bike shop who took two weeks before they could give it a look and two weeks later basically just tried to use the tool with a clamp and it just got chewed up more. Didn't inspire confidence so I took it back and now trying to figure out next steps.

These suggestions have all been helpful food for thought.