If you had a welder, you could try placing about three equally spaced raised welds onto the inner race. Then maybe use those to drift against.

Or try drilling about three equally spaced holes in the inner race, then maybe you will have some purchase for a thin drift / pin punch. You might find the race is hard to drill, depending on the tools and expertise you have.

Or you could remove the bearing seals, and take your time slowly destroying the bearing inner race and cage. I would say by grinding ( e.g. with a Dremel or preferably a larger tool with a little more grunt ) and then levering out the remnants, and eventually removing the balls. Then you are left with the outer race firmly still held in. With a grinder again ( and using e.g. a "mounted point" in the same grinding tool as before ), you can carefully grind through the outer race at one point, avoiding touching the alloy cups as much as possible, going all across the race. I finish with a small cold chisel to break the race all the way through. Then the interference fit will be lost and you can remove the race. Lots of careful work involved but I have done this type of thing several times, when I didn't have the expensive tool and had the time and inclination to do it.