Some people have had success with a flat plate puller on the end of the axle shaft, drilling holes through the wheel for the puller screws, and using a steel washer under the nuts on the other side of the wheel. Use three or four fine-thread puller screws of at least 10 mm diameter, and make sure they are on a small pitch circle diameter, right in close to the wheel hub, or you'll just break the wheel. Use plenty of Penetrene or equivalent on the hub where the axle goes through it, soak for a couple of days, then tighten the puller screws in rotation, only going one flat on the nut on each screw as you go around. Tap the screws axially, on the back side of the wheel, with a hammer each time you tighten them. You should get it off without a whole lot of trouble, but the bore of the hub may be in bad shape from the corrosion. Remember, use an anti-corrosion coating on those steel-to-aluminium joints in future.