I've seen a situation like that where an arbor that fit perfectly in the bearing's inner race (sounds like 15 mm from your spec) was used in combination with thick grease to form a hydraulic force to move a bearing out of a blind hole like that. Load the bearing's bore with grease insert the arbor onto that and drive the arbor inward. The grease is forced behind the bearing and the bearing has no where to go but back out of the bore.

Might not work with every kind of bearing or with one that is exceptionally tight but it's a pretty clever outside the box solution, I thought. The arbor needs to be tight and long enough to get a good hammer blow to it, and wrap some rag around the arbor to prevent and high velocity grease that might be ejected. Keep adding grease until you can get a grip on it some other way. Snap-On once had a tool with a hook at one end and a handle and place to land hammer blows on the other end, put the hook into the bore or behind the edge of a seal, cock it a bit to get it off center so the hook gets some purchase on the inside edge and then apply some hammer to it, pulling the hooked end out with the bearing or seal.