Hey BMLlednar, so I created my own Landmarks mod a couple months ago on Steam
http://steamcommunity.com/sharedfiles/filedetails/?id=1206264578
If you want a template of how to implement new Landmarks, and Delete old ones I'd recommend downloading it, then going into the .Pack file using the PFM to view all the important effected tables.
So assuming you understand how the TW Assembly Tool Kit (TK) and Pack File Manager(PFM) work let me walk you through exactly what you'll need to do to create a stable mod that puts Clan Mors Hq (CM) in Karak Eight Peaks (KEP)!
Luckily for you you'll be editing a Unique settlement so it will actually be a really straightforward process (for my mod I had to edit the start.pos file which sucked since I learned through trial and error lol)
So starting off in the TK with DAVE the first table you'll need to edit:
slot_template_to_building_superchain_junctions
In here is where you assign what buildings can be built in a certain type of settlement and what slot they can be built in. So since you're adding an existing building to KEP your going to want to click "Add Record" the ID column will autogenerate a number for you, then under slot_template you enter
wh_main_special_eight_peaks_secondary
then under building_superchain you enter
wh2_main_sch_special_mors_hq
Now truthfully that is all that is required to add a building to a unique settlement, as the building and everything related to it already exist there is no more work to be done in the TK! So you would then follow the tutorials to export your data and create a .pack file which you then Open in PFM and delete everything except for your changes and save it and load up a game as it should be save compatible and bask in your new buildings glory!
However if you want to also DELETE this building in its original location it might be a little trickier as I'm not familiar with how to have the PFM to delete content, although I believe a raw .pack file from the TK with it deleted would work however then you couldn't edit it in the PFM, but anyway I hope this helps