It's a wonder that no-one has come up with a software version of the chord sequencer.
Surely it can't be that difficult. It's not like it would need patch information or other instrument specific data, just an ability to receive chord (notes) data from the G70, (or other arranger) and then simply re-transmit it on a loop.
So hook-up a laptop, or even one of those EEE mini pc's, and off you go.. But as with anything, there is probably a lot more to it than that.
Maybe programmers have not seen/heard enough call for such a utility to bother with writing one??
Dennis