In a lot of ways, what you are looking at doing is the same as what you are currently doing, but in one convenient (and, for the DC side, more powerful) package. When you use the Tech 6 in "dual mode", it is operating as a DCC command station and in standard mode it is operating as a DC throttle.
No experience with the Tech 6 myself, but IIRC that's the one that BRAKIE uses and really likes. You might drop him a PM if he doesn't chime in here.
Mike Lehman
Urbana, IL