Cant you just modify the standard adjustable inner bush shown in the diagram.
Modify the mount to take larger round bits and make new offset round bits to fit on a new bolt.
These are off an old BMW. Standard on the right and modified on the left.
View attachment 511597
Below is the modified mount;
View attachment 511598
Seventies Aussie fords used the same system, if it was good enough for Mad Max ............................
BTW if the bolt ever gets loose the bump steer is interesting