Do a club event...
Last year my father ran a simple aerobatics event in his club partially to experiment, partially to drum up interest in competition. Anyway, maybe that could be done here. If you wait for SPA to come out with a new class or the like, you might be waiting a long time... If somebody were to approach their club and get a day or a weekend where they could use the field, advertise it here as an old style unofficial club event or something similar, call it an "Old School Pattern Fun Fly" or something... Everybody bring their 70's-80's missles and have a good time. If the turn out is good... go to SPA with it, and maybe they'll add a class!
Just and idea... yeah, I know it's much easier to 'type and run'....