Yaaay!! A full Byzantine roster would of course be most welcome, but even one command set with officers/standard bearers/musicians would be super useful, because the empire used so many mercenaries they could be placed onto the other Strelets Viking/Anglo-Saxon/Norman sets with ease to create believable armies pretty quickly. After all, the Battle of Dyrrhachium in 1081 featured a bunch of Harald Godwinson's former elites in the service of Emperor Alexios I Komnenos, a trip they were regretting afterwards!

The fact that a few 'refugee' Houscarls of Harald II's retinue may have made it to Byzantium post-1066 is one of those things that sets the imagination going. It is indeed probable that elite Northern European infantrymen in the service of the Emperor Alexios I Komnenos (and his predecessor(s)) would have been Viking/Rus in origin, but this does not preclude Saxons as well. The ability to wield a two-handed battle-axe with skill was clearly valued in the Byzantine military.

I'm sure that a decade or two as an elite soldier in the service of the Emperor in the relative luxury of Byzantium cannot have been that bad....certainly in comparison with a life of servitude to a Norman Lord in rainy Britain.