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Technically it is possible. But without hotend like Cyclops from E3D, you will lose a lot of print area. With two common E3D v5 clones I would suggest 50mm longer rods in Y axis direction and to place two bowden hotends one on a other. Their fan mounts have to be tightened together by M3 threaded rods as such length of M3 screw is not available. Only one 40mm fan will be used, it will be common for both hotends. You will have to figure out where to put extruders and eventually make an insert for bowden fitting that will change 28BYJ-48 short distance extruder into bowden extruder.