To make a Europa without a gearbox into a roller:-
Get a wooden pallet.
Screw 2 x 4 ft long 4 x 2s to the long edges.
Screw 6" castor wheels to the end of each 4 x 2.
Jack the back up, and put on 2 axle stands.
Jack the front up under the centre of the chassis crossmember (where the closing plate is bolted to the chassis).
Push the pallet on wheels under the car.
Remove jack and axle stands, and the car can be pushed most places.
(I copied F1 pit crews pushing their cars into the pits).
Make sure the pallet is forward of the petrol tanks if you are taking them out.