When I worked offshore in the instrumentation world the majority of what I did when I started out was bending tubing for process and utility connections. We did mainly from 1/8th inch up to 1-1/4 inch stainless 316, 317L, monel, inconel, 2507...Thousands of feet and the bender makes all the difference. You need a shoe with the diameter desired that is rounded out to hold the tube then a shoe to pass around the outside with the same diameter as the tube, rollers on the outside give the best bend without flattening. Most benders that I've used without rollers on the shoe flatten the tube to some degree. With all of that nonsense I just laid out you're on the right track with just buying pre-bent pieces. It'll be less headache since you don't have access to a bender.
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