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I am not sure that is going to do much for the bump steer. I think the arc described by the outboard steering joint as the upright/stub axle carrier rises in bump is not going to be same as the arc described by the steering arm, as it rises in bump. You need to have the steering arm at close to the same static angle as the top wishbone. To get it perfect it needs to be parallel to and of the same radius as the theoretical middle wishbone. As the wheel rises in bump, the top of the upright is going to move inwards. Whereas the end of your steering arm is going to move outwards. It is very difficult to totally eliminate bump steer unless you have parallel wishbones, like you see on most single seat cars.

The easiest way to visualise this is to cut out bits of cardboard the length of the wishbones, upright/stub axle carrier and steering arm, tack them to a large sheet of plywood, using brass two tail press through fasteners to represent the joints. You can them move the upright up and down to see the effects of bump steer. Before CAD, this is how suspension used to be designed. I doubt Morgan used anything as sophisticated as this :-)