Glad to hear things are going well for your enterprise. The ackerman angle is fixed, so the centerline of the outer tie rod relative to the lower ball joint will only move as required to stay on an imaginary line drawn between the lower ball joint pivot point and the outer tie rod pivot point. Since most R&P kits are designed to work with the stock geometry, the drop of the steering arm needs to stay the same as well. Moving the tie rod pickup towards the ball joint 1" is fairly conservative, but I certainly wouldn't move it in more than 1.5". Since you are reluctant to absorb all the risk on this, tell us how many sets you would have to produce to make it worth your while. Maybe you could take a deposit from the members? Alternatively, if I was to put up half the funding (assuming I can actually afford it), would you be willing to let me in on half the profits from this particular spindle design? I can provide drawings if you are willing to move ahead on this project.