Probably against every code in sight, but the four wire range
connection is ground, neutral and the two legs of the 220 volt line --
so that 110 volt components of the range will function. What you need
to make up is a four prong plug to three prong SOCKET, where you only
bring the two hot lines and the ground across, leaving out the neutral.
You should be able to get the parts you need from any good electrical
supply house, or Lowes, Home depot. Worst case, if you can't find a
three prong socket that goes on a cord, you will have to buy a metal
box, plate, and three prong socket. Then bring three wires (of
sufficient gauge) from this socket to the four prong plug. If you
can't get a four prong plug, a short "pigtail" replacement for a range
should do the trick, as that will have the four wires (you are only
going to use three) and an attached four prong plug. As to what wire
are which, the green should be ground. Use your multimeter to measure
which are the 220 volt pair. Tape off the neutral.
That should do the trick.
Go on line to some outfit like United Electrical Supply and see what
bits and pieces they have, or Lowes/Home Depot.