Create can already do this!
Drop multipage PDF onto the Create dock tile, drag out from the Image well as PDF.
To automate it - save an applescript like this:
-- make a new unique folder name based on the current time
set basedir to "~/Documents/Create/slides-"
set theDate to current date
set destination to basedir & year of theDate & ¬
"-" & month of theDate & "-" & day of theDate & "+" & time of theDate ¬
tell application "Create"
tell the front document
set thepages to pages
set totalpages to pagecount
repeat with i from 1 to totalpages
if i < 10 then set filename to destination & "Slide_0" & i & ".pdf"
if i > 9 then set filename to destination & "Slide_" & i & ".pdf"
set currentpage to i
tell page i
export in filename