Yea, and expensive. Also even if you had all the RAM in the world, classila is unstable with no virtual memory . 

I dont know if they make SD to PCMCIA converters, but they do make PCMCIA to compactflash adapters. You can get a pretty decent size compact flash card for virtual memory. 

As far as being able to tell the OS where to store virtual memory, that part I do not know.