Longer lines will work fine. You will just need to fully compress each corner/wheel of the Jeep in order to insure that the line isn't getting pinched in anything. Loose zip tie loops, where needed, can direct the lines along a desired path.
Oem brake lines that come on a 2017 jk are very good brake lines and plenty long even for a 3.5 lift. I installed a metal cloak 3.5 on my buddy’s jeep and oem brake lines were as long as the mc brake lines. So unless you are just after looks i would keep them. I personally would not want extra long lines if i just had a leveling kit or even a 2.5 lift.
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