in CoW 1.5, Wissenland has inner circle knight bodyguard, which is little awkward that innercircle knights are actually high-level knights of all knightly orders.
My suggestion is that make griffon knights as a bodyguard for Wissenland.
Griffon knights were formed by Emperor Magnus the pious, who was former elector-count of Nuln. After that, Griffon knights served as bodyguards of Emperor who elected from Nuln. Now, Griffon knight places their HQ in Altdorf and Nuln and think Reiksguads as their rivals(because they were former emperor's bodyguard when Nuln obtain the Throne.)
in this mod, Nuln is act as a capital of the Wissenand, so Griffon knights are more suitable than innercircle knights