Yep - think having it milled out may be the only real option now
I get what people are saying above about jigs etc. Buy if you use a smaller milling bit you've got more room for error if you've not got a perfect straight and steady line through the BB. IANAM (I am not a machinist).
@fizzy.bleach started
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Yep - think having it milled out may be the only real option now