for “programming” I mean put together a series of exotic and cumbersome plugins with a steep learning curve, to find that they don’t work after having wasted a day of fiddling around … 
anyway, your tip simply doesn’t work with Ableton, as explained by Davide here
what you don’t know, not being an Ableton user, is that nevertheless the MIDI channels you route, Ableton will nicely kill your marvelous convoluted exotic routing sending all data in Channel 1 
So there is no working workaround currently, apart using multiple Scalers, that is the better/easier way to orchestrate with BBCSO Discover, OPUS Pop Brass, and Garritan World Instruments IMHO