Udders, the answer to your question maybe lies in knut's response to the opening post in the other thread.
In it, knut voices an opinion that there are only two ways up (or down) Sweden. The coastal (eastern side) way and the inland (western side) way, which runs near enough parallel to the border with Norway. Of the two, knut says that the western route is the more interesting. That gives you somewhere to start. knut's broader claim is that Sweden is 'boring', I guess in as much as it doesn't have the dramatic mountain scenery and roads that Norway, more easily, offers up. Of course we regularly read that north eastern France is boring. I guess that bods would say the same of the northwest coast of France and inland into Normandy, if it weren't for the D-Day beaches.
I suppose that many might describe Norfolk, much of Suffolk and swathes of Lincolnshire as 'boring' too. But their opinion is arguably biased or they want something different (ie to them more 'exciting') when riding their motorcycle. Yes, Sweden is predominantly flat and very largely empty of anything bar trees and lakes. If you can step away from blindly accepting that sweeping statement, then look instead at what else it might offer that is 'different', then you might enjoy it. The article that prompted the 'Sweden only' thread was lifted out of a German magazine. It's purpose was:
a. For the journalist to tell the readers what he had done. There's lots of words in German and lots of pictures. He purposely stayed within the borders of Sweden, as that is what he wanted to do. I did the same when I lapped the outside of Germany, including all the 'boring bits' along the Baltic coast, then down the 'boring' bit to Berlin and southwards to Passau. Was it all 'boring'? Of course not, it was just different.
b. To hopefully put an idea into the heads of bods on UKGSer that there are other countries outside of Norway to visit, in the hope that it might spark some interest.
Look at the 'Sweden only' post. Get a map or two. Do some surfing around on the internet. Look at the pictures. Get a 'Rough guide to.....' book and create some ideas of your own. In short, use some imagination. You've got all autumn, winter and much of the spring, after all.
you recommend? 
You’ve lost me? I never mentioned his missus? 
