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Can Sram it if you want, I really like the doubletap apex on my bike, shifts perfectly (at the back) everytime and I don't like the brake lever moving on shimano, but both work fine and are more of a preference thing. I've always preferred shimano mtb shifters though. Main area shimano wins is brakes, some people seem to like sram/avid brakes but I've only ever had bad experiences and heard bad things from a lot of people.
So get a sram drivechain and hope brakes, obviously.
Shall I just go all SRAM for matchy matchy sake?
The main reason why I don't like SRAM is I have SRAM on my road bike and I absolutely cannot get on with the double tap system... obviously with flatbar there isn't that issue? Any 'downside' of SRAM in terms of shifting?