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I like that idea, I would use my bar bag too. I'm not really fussed about being in my jersey as I can't imagine the heat/sweat would do it any good..
So bar bag/stem bag/or speed strap http://www.mettlecycling.com/blogcontent/2016/17/4/the-mettle-speed-strap-is-finally-here
So interchangeable lenses arnt that big of an issue, as previously mentioned it's going to be my off bike camera too
I just use an Alpkit Stemcell XL, fits my Fuji Xpro with a 52mm lens in no problem, easy to get the camera out and pop it back in, and its not in the way or annoyingly in my pocket.