elcruxio thanks for your detailed comments. TBH, I hesitate. On the plus side there is the potential for a radically different hand position, something I've tried before, similar to robow , currently relying on inner bar ends, not aero at all, not exactly what I am looking for in ergonomic terms either.

The plan is to use them for a trip next Spring-Summer. I won't have much time to test this setup before flying out (perhaps 2 weekends). Assuming that I can mount Redshift on my handlebars, it implies replacing the handlebar bag (5L) with backpacking bags (lots of positive reviews about Tailfin Flip and Wedge, but expensive...). Current setup is actually not bad. Not sure if aero + new bags will be an improvement.