For the life of me, I've never seen or heard of copper being utilized in brake lines. It simply won't withstand the working pressures nor any heat generated from components in close proximity. Be that as it may, in the US we have several options for repairing / replacing brake lines.
1. Aftermarket line SECTIONS are available at (chain type) stores pre-flared with the fittings captured / attached on the lines, in various lengths typically from 1 to 6 feet. They come straight and we bend them to fit. If we require longer lengths, then couplers are added between sections.
2. We source good / used sections.
3. We procure OE (pre-bent) lines from local dealership parts departments.
4. We task a brake specialty auto shop to custom mfg our lines per sample. Special benders and double flare, flaring tools are needed in support.
Good news. I've got the Suzuki Parts Catalog in front of me and all of the lines are assigned part numbers, so yes...you can source / buy them that way as well from Suzuki it would appear.
I can post a diagram and those part numbers if you need, but require this info; what year GV, and ABS or non-ABS.