Excellent notion!
Without knowing the context, a gang of hockey tourists walking on a street wearing these T-shirts would be likely associated first to Far Right wing / Nazi Skin Heads than to the Fan Cult of Hockey player.
Black/Blue colors and Coat of Arms lion together is very strong cultural and traditional code for something totally else here in Finland than what it now represent very funny way in New York.
Exactly for that reason I don't think markets in Finland will be very broad with C.O.K. merch of this type. Some Finns may get even offended for how the Coat of Arms is utilized in this context (maybe including some people in aforementioned far-right wing).
Church itself is nice thing IMO. Part of Clergy myself, btw.