Once I thought about making an i2c expander for JF that has 6 gate inputs and 6 1v/oct cv inputs to make use of it as a standalone voice. And Gil has been extremely helpful.
But then I think that if you want to operate JF like a poly voice, TELEXi + TT + JF is the end-game, most versatile long term solution.
And since I believe in virtuosity which requires a musician to spend long time with single instrument, I would prefer to go to an end-game solution directly.