I've used the regular lines from David Silver Spares. I'm not sure how much a braided line will help you on a 350F and what kind of riding you'd be doing. But for regular riding regular lines have worked for me. And the cheaper, aftermarket lines from DSS worked just fine, at about a quarter of the price. I've used the DSS MC as well, and they work great.
I also am not a big fan of 4 into 1, but I was in a hurry and needed to get a bike wrapped up and so I used their kit for the 350F brake, the whole shebang, and it worked just fine (at least for now).
While making your own lines might be an option, I've also seen braided lines that forego the rear brake switch at the triple tree. That switch usually goes bad and doesn't work anyway, but if you want to retain it you'll want to make sure you can get (or make) the two independent pieces with the correct fittings.