Real could convince him with crazy money and the massive exposure that comes with playing for Real. Their chance is in January when Dortmund want to sell him before he becomes a free agent and leaves for Bayern next summer. Real should try to convince him at that point.
Real already tried everything to get him in summer and Dortmund were willing to sell to them. Lewandowski was not interested, as a deal with Bayern was agreed long before summer.
Verona have first refusal anyway, for €14m. Not likely they could stump it up, but if he's really interesting they could always work with a bigger club to pay it out then straight to co-ownership.
I didn't watch him much either, I think only once. I heard very good things about him, though. Some reports say he's really come to them. Sounds like a BS to me.