The Mass could be scheduled once a month at four o'clock on a Sunday afternoon in a different parish each week. (It would be best not to advertise it in case there was any danger of seeming to dissent from the reforms of Pope Benedict.) In some places, it might be possible to set up a personal parish for the rite of the 1970s but only if the Council of Priests are in full agreement.
The SSPVI would need to bring their own pottery chalice(s), pizza hosts, polyester vestments, guitars and Celebration Hymn Books. They would also need an ironing board or similar to set up with two squat candlesticks at one end for Mass facing the people. The priest who was preaching would, of course, be on his honour not to say anything against the Traditional Latin Mass.
A great plan, no?