I hate to sound like a Watchtower advocate here, but keep in mind this is not government money that is going to the Watchtower, its money that individuals are paying in to the government to distribute to the religions. If X% of the money came from adherents of religion Y, then religion Y gets that percentage of the money.
If they are not going to give the Watchtower their share of the money, then JWs should not be required to pay the money into the government in the first place.
No Apologies (feels somehow unclean)