Yes, I think it would be doable to link the two - It might be easier to do Stelvio from the Bormio side (since that's closer to the Mortirolo and Gavia), and then you can descend down to the opposite side of Stelvio (down to Prato allo Stelvio) so that you can climb it from that side, since that's the really cool side

Ok, enough hijacking of this thread! I have continued the talk about the "pre-season social" here: Cyclist Spring Social (Zurich)