Great idea. To be practicable, it would have to condensed at bit more and perhaps some features would have to compromised, but a nice featured arranger at a fraction of the full keyboard version. Module idea certainly isn't new.

Personally, I would just go with one full keyboard arranger that suits my needs, but maybe some more adventurous users would want the best different worlds with features and sounds from perhaps two or more brands with a more cost effective option.

Marcus