The same seller who markets the power monster scsi-cf cards for powerbooks appears to have come up with something special for the SE/30:

http://cgi.ebay.ca/Stratos-SE-30-Dual-Slot-PDS-Accelerator-adapter-New_W0QQitemZ300289176754QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item300289176754&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A10%7C39%3A1%7C240%3A1318

And once again, they're not cheap.