The above suggestion works, but the only thing is that I found the sound slightly congested because of the excessively small-diametre opening of the Shure Flex tips. I would try to find someone with the TDK BA100 tips willing to trade for other types of tips; they're single flange and fit perfectly on the BA200. It's too bad they didn't bundle single flange tips with the BA200 as well. Fischer Audio DBA-02 tips work reasonably well too. Etymotic tips (their entire range) should also work, but comfort is variable, as no other company designs more 'invasive' tips.
I too prefer the sound of the dual flange tips, but honestly, I would say that the sound with the Comply tips is not as bad as you described it. It does smooth out details, but the presentation is quite pleasant, and anyone can listen to it for hours on end with zero fatigue. It is with the Comply tips that I felt the BA200 came closest to the UM3X presentation. I believe that was the intended purpose for pairing the Comply tips with the BA200 --- to give it non-fatiguing, monitoring capabilities.