re: Can we wear grey uniforms at home too?

I don't think so. Grey uniforms on the road is an inviolable and longstanding tradition in baseball played at all levels-- this dates back to the 1800's. And it's more than just superstition, and tradition: there's a real practical reason for road greys.

Do that, and you may as well celebrate Easter Sunday on Saturday. Some traditions are not to be tampered with.