Originally Posted by unterhausen

There is enough slop in the chainstay sockets that the rear dropout spacing doesn't really affect the angle. Maybe you would have to bend the sockets a little to get out to 148mm, but I'm not even sure about that.

Pardon me if I'm wrong, but IIRC you are obsessed with lug angles to a degree that nobody else is. I suggest you draft things out to figure out questions like this for yourself. I am pretty sure that the chainstay view of rattlecad will answer this particular question fairly quickly. it also might help to buy a tube/lug set and play with it a little