Reaming a brake line end

On the left is the brake line that came with my right stuff kit
Because I mounted the calipers to the rear that brake line would not work using stock brake line location.
On the right is the remedy according to right stuff it is a hose for a 69-73 camaro. It will work perfectly except the hole for the banjo bolt is to small by about .005 proper size is 7/16(.437)
I need to ream hone or drill it out to fit, but I don't want to destroy the end. has anyone encountered this. If so what was your solution. I found a 7/16 valve guide hone on line.
Any suggestions would be helpful and as always thank you for your knowledgeView attachment 1715095920

Mototools are a great thing.