I'll preface this by saying that I don't know anything about the bottom bracket shell damage or the bottom bracket you're using and looking to replace.

Velo Orange used to make an expanding threadless bottom bracket that might work in your situation. I don't see it on their website, but here's a link that might lead you to one and/or give you an idea how they work. EBat?

Bottom Brackets - Velo Orange Threadless - Nelo's Cycles

BB Shell Width: 68. Threadless versions expand to tighten into the bottom bracket shell without damaging threads; once removed the original threads can be reused. Bearing Type Ball Bearing. Part Number BB-0001-113_113 mm.