I've wanted to do this as well, as far as I can tell there isn't exactly a simple way to do it. The way I think it will work (but I haven't taken the time to map this out in the environment) is to use either transformers or channel splitter to send each note to the specific instrument in DMD. When I get around to doing that I'll end up using a dedicated layer in the evironment to keep things tidy. It is super annoying that the devs haven't worked out a way to do this, I want to control DMD from my BeatStep Pro but that will take some work.
I guess the other workaround is to create then DMD set you like and then use Autosampler to make a single instrument out of it.
Related tip, I keep a project with nothing but my environment objects that I can import into other projects rather than having to keep repeating my efforts.
2011 iMac 12 gigs RAM (10.13.6)
2018 Mac Mini i7, 32 gigs RAM (10.14.6)
MOTU 828 MKIII Hybrid
Behringer ADA8200 x2
MOTU Midi Express x 2
A nice variety of old analog and hybrid synths
Novation stuff out the wazoo, including an SL61mk2, SL37, ZeroSLmk2http://www.shaneking.comhttp://www.redgreenblue.bandcamp.com