Hello everyone, firstly I apologize for my bad english . Secondly, I worked to a submod for The Last Kingdom 3.06 to add 4tpy. I've tested this submod and it seem work well. Anyway, make a back up of these files: campaign_script and descr_strat if you want to go back to the vanilla mod.
Installation: overwrite the data folder in C:\Program Files\SEGA\Medieval II Total War\mods\Last_Kingdom.

https://www.dropbox.com/s/cocq3mz7w7...03.06.rar?dl=0