The fuel lines are easier to work with as they are a few magnitudes of lower pressure than the brake. They are also available in parts stores by the foot - you will need to straighten them the best you can (which can be annoying)

brake lines are not too difficult to work with

I have replaced quite a few entire sets in different cars, copper nickel line is easy to work with and flares beautifully, the flare nuts are super cheap too.

If you bend and angle the line nicely it'll look just like factory line.

a roll is cheap online or NAPA is great for it. they sell it by the foot. You can go in any parts store and ask for a 6ft section of european fitting line by eyeballing the picture here (for abt less than 10 dollars). The european ones are for our cars and for late model GM cars.

dont sweat or waste time on undoing that union in your car - just cut the line off.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)