Hey Charlie,
trying to follow your problem with crashes of K7. This path, that is shown in this error message by Native Access, does it still exist on your disk like this? Also wondering if the "dot" at the end was part of the path or just part of the message in NA?
Did you try to manually remove this path via finder?
As the crashes might relate to something in the paths written for that library, you would want to get rid of all its traces, which contain the path or the product name.
To clean your system from all traces of this library make sure to delete this content path, which was noted in the NA error message and also the JSON, XML and the PLIST files related to that particular library.
Keep Native Access closed during this process and when restarting K7. Because Native Access might/will rewrite the deleted XMLs and JSON files, maybe even the plist files.
/Library/Application Support/Native Instruments/Service Center/The_faulty_Library.xml
/Users/Shared/Native Instruments/installed_products/The_faulty_Library.json
/Library/Preferences/com.native-instruments.The_faulty_Library.plist
Does not hurt to also delete this folder before restarting K7, which is also used by the db3 (holds pics and meta data for the installed libs):
/Users/Shared/NI Resources
Hope this helps it, as I tend to believe also that it might be the borked install of one of the libraries you mentioned, which causes the db3 datatbase scan to crash.
Regarding the Kernel Panic thing caused by certain display setups, you tried 2 displays so far, right and the smallest one was still a 4k display?
If you have display at hand that is really low profile, I would give this another shot, as for some users this was the only way out if just cable or resolution change did not help. Try a TV maybe? Just to rule out any of this kernel panic related stuff.
cheers, Daniel!