At some point is stops being an upgrade and just becomes work. The current fuel lines are a combination of hard plastic and steel, they're very resistant to fuel and the right shape. If you replace them with unbraided PTFE then you still have lines that are difficult to shape and require a lot of work to fit, but don't get the protection of having a steel overbraid (note - the main reason people replace their lines is because of concerns of SC belt breakage damaging the lines). Given the choice between the OEM lines or unbraided PTFE, i'd just stick with the OEM ones without agro of cut hands, cost or trial fitting as they don't bring any value.
A fair few people have fitted braided lines here, including myself - http://www.vx220.org...oday/?p=1884553 without much issue, if you're going to reinvent the wheel, i'd weigh up the pros and cons of doing so and exactly what you're looking to get out of doing this.