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I think the issue with using bar-ends is that they're unlikely to be perfectly aligned with the swept section. That may not be an issue depending on exactly how you want to hold them and how much you can cover up with tape. The bulge will mostly be behind the bar, so it shouldn't get in the way of your hands.
For making the bar the biggest challenge for DIYing it would seem to me to be getting the mitres exactly co-planar so that the swept sections are correclt aligned. Do you have a jig to use?
ffm-
Wouldn't need a jig, just a centre line on the tube and align the mitres.
If I were you on this, I would get an old frame and chop it up for tubes and practice making the mitres and just see how that goes. If you nail that you could then get some nicer more appropriate tube and then just find yourself a place that does metal fabrication and ask them to stick it all together.
There are mitre calculators on line. You put on the tube sizes and angles it then makes you a template. You print it out, stick it on the tube and cut your mitre.
Dogtemple
I like the way you think, it's something I gave some consideration. If I could make something like this I'd be happy.
Even then, I'd be concerned with the bulge where the bar end connects with the main bar. That's the place I'd probably use the most, the 'hoods' position. I'll have a look around and see what I can find, perhaps there are legs on this.
One might notice it's starting to resemble Casey's Crazy bars. There's a couple of problems I make myself seeing on it so I can keep fantasising about blowtorching things: it looks terrible, and the hoods position has two tubes meeting at an angle. Don't know how the hand is supposed to rest there.
I keep finding that the DIY route is only half delirious. I reckon getting the tubes from ceeway might not cost much (3 x 410mm lengths of Gara 22.2), mitering is for free and a pleasant and rewarding activity (in my head, ok). The missing part of the puzzle is the brazing, I've never been close to a torch and I'd have to either find a workshop that allows someone like me to burn stuff, or find a kind soul that'd be willing to do me a job for an exchange of money.
Will keep brewing this.