Of course their are boundaries. A church that is large enough and has the ability can open a school, a day care and other things that provide wholesome alternatives to the pagan culture.
Isn’t that kind of what the Boy Scouts are too? Nothing wrong with churches joining Upper Basketball or setting up clubs and activities for kids. Lots of churches offer alternatives to Halloween these days too, nothing wrong with that.
The boundary is to make sure these things are wholesome and are real alternatives.
And a church that is large enough can offer many alternatives—
Traditional Church
Country Western Church
Soul Church
U2 Church
Rap Church
Praise Church
All of these will have their supporters and detractors, one group will NOT worship with the other. Great now we have again fractured the Church of Jesus Christ into smaller pieces to the point we can't worship together.