Excellent research Radzeer, many thanks!
Actually, the Junior and Senior Druzhina ranks made me think a bit - maybe a specific military rank system for the Rus and Novgorod could work where these ranks replace the suggested Royal Court Member and War Council Member ranks.
The offices titles you mentioned could also be nicely put in, although it's not sure that all will make the cut.
Have another deserved rep for your kind help, mate!