I don’t think the recent cancelling of prayers at council meetings is really such a ‘threat to Christians’, though it is perhaps a pity that a court case had to be involved. Somehow a regular slot for mandatory prayers at the top of an agenda can so easily become repetitive or mechanical.
One would hope in councils where there are councillors of other faiths, their prayers were sometimes included. In any case, would not the simplest answer (as one or two people have already suggested) be to hold a few minutes of silence, Quaker fashion? This could have a unifying effect, and would surely offend no-one.