About KHL teams in the NHL series, you can at the moment play with Dinamo Riga in NHL 18 in the Spengler Cup. Unfortunately they are playable only in that mode.
What would be nice at least would be to allow the user to customize more the teams, EA Sports used to do it for FIFA with create a team, and with Madden, but apparently for right use and because the focused more on the Ultimate team mode they removed it.
I have NBA 2k and you can download some logos, renames the teams and personalized the jersey. Would be great they get back with some NHL 2k offering the same opportunities.