In a word - no.
NV Flash RAM is a different animal to the volatile RAM modules that comprise main memory.
The read / write and refesh time is an order of magnitude slower than RAM - not to speak of the USB or PCI bus speeds.
HOWEVER - if you are prepared to dedicate a USB solid-state device and ensure that it is permanently attached to the PC, you could try putting your system paging file there. It "should" be faster than the physical disk, thereby improving pagefile reads & writes., plus you would recover some disk space!!
You would need to ensure that you always had the device connected at system startup, never "ejected" it and didn't mess around with other detachable devices (e.g. CD / DVD players) that would screw up the drive lettering.
Not tried it myself, so I can't guarantee that Windows will let you do it.
If you try it, let me know!
SD