Scott, you can use Hypercanvas and Super Quartet for accompaniment but you would now need to ensure that the style calls up the appropriate instrument. This would be a little more work than staying with GM or better yet XG formats for Yamaha Styles. This is where using software is flexible so that you can setup a system that best suits your needs.
I use the Roland A37 as my controller keyboard. It is a 76 note keyboard with a good feel and with 128 setups for saving into its flash memory. I have had it for a number of years and seems to standup well.
Rikki is right in that there would not be enough users to warrant a separate user group. Plus those that go this route do things differently from most others and therefore providing information on your setups would not be that useful...I think.