hi rikki,
i can't imagine it would sound all that bad..they are after all, just little midi seqences,BIAB and arrangers...might require some tweaking of sounds and levels...bu imo, it would work okay...although i reckon OMB would be a simpler workflow perhaps, even though i am having issues with it, as you already know...but i have those probs sorted out, by just setting up various multis on my s90es using the 16 channels available and then just disabling bank and program change messages, it's working well, and i've got to say the arranger patterns uisng the motif ES sounds are just superb, evey bit as good as the T2, and in some instances better....
cheers
dennis