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The bar end shifter is perfectly fine to be honest, nothing to improve upon, it's just that I am immensely restless and want to try new (=old) things - especially when they are cheap.
The FD-mounted shifter is something I wanted to try some 2 years ago, but I got stuck when it came to actually mounting the shifter - albeit I didn't have any SRAM stuff, only Shimano. I think I could somehow manage to bodge it up. But again, these downtube shifters would only cost a tenner...
It would be really nice if someone would make an affordable 31.8mm thumbie clamp. As much as I love Paul Components, 65 bucks for that kind of product is ridiculous, although I'm certain at one point I will place an order on them.
Lots of options, I will also have a set of Sora STIs to play with later on.
If you want to improve upon the ergonomics of bar ends (which is hard imo) I'd go for stem mounted shifters or you can adapt an FD-band-on clamp and mount a sram trigger shifter.