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I can't replace the whole line, its a 72 Imperial so there's like 900-feet of it wrapped all around the whole front end!

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Yes you can!
You just don't want to.

Yep, cut back, install nut, flare, connect to short length of new tube.

It's a DOUBLE 45 degree flare. Not a single.

For what it's worth, the clueless morons at the parts store don't know their brake lines from their azz. They'll hand you everything but the right one.

Tell them it's 3/16ths line with 3/8-24 FLARE (not bubble) fittings in the length you need. They come in 10" multiples.
Good luck with those morons.