I agree that something doesn't seem to add up with the height, but setting that aside...
I wonder if it would get close if you reamed the taper in the steering arms the other way and use tie rod ends with a slightly larger taper so they go underneath? Extended studs as per your drawing could work too provided it still has adequate strength. Whether that's even possible with the space available is another question, I imagine wheel clearance will be an issue. There is also a problem with the rack inner joint spacing now being too wide with it mounted that much lower, dropping the outer ends might not be enough to reduce the bump steer to an acceptable range.
I know over here they frown on heim joints as replacements for steering and suspension ball joints on the road, but they are commonly used in race cars so I guess it's just a matter of more frequent checking and maintenance. Could improve options for adjustment and clearance.
With that level of modification it may make sense to look at re-engineering the entire front end, although I doubt any of the off-the-shelf options would offer an extra 100mm of clearance. As you say a lot of them are lightweight straight-line (drag racing) rather than handling packages, but the bar isn't very high now and they do tend to focus on engine and exhaust clearance as a big selling point.
Edited by 76lxhatch, 22 October 2023 - 02:47 PM.