Tithe is a regularly sent set amount and yes the congregations are already doing that except the amount varies to some degree.
I can see them making an arrangement for pubs pledging to do the same. Sent automatically through their bank accounts a set amount depending on what they could afford.
Yep, people pay their bills like this all the time and their donations to charities. Why not to the borg in leu (have I spelt that right?) of charites?
I could see it becoming a "not a tithe" thing.