Corn heads were not available for the 65, 96, 106, or 6601. The 7721 would handle a 4 row. Nor would it be easy to adapt them, as most of those models did not have a swing pole, plus the feeder house would need to be offset on the corn head.
There are pictures posted on here of our 96 when we sold it this spring. We had purchased it with some of the ideas you have, but never got around to it.