Did you ever find those Sibelius scores anyplace affordably? Your posting is quiet a while ago, but I too am now looking for Opus 75 for example. But for entirely different reasons than what you mentioned in your old posting. Leif Ove Andsnes recorded some or all on Sony Classical 88985408502, I am not sure when. Been hearing some of those on Dutch classical radio. I have a thing with trees and wood, which might make an interesting "theme." But yes the cost per piece is high, although I have yet to price each at the typical professional score venues. Greetings from The Netherlands.
You can download them for free on IMSLP.
Nope. according to imslp, the scores are under copyright in Europe
Oh, I didn't know that. Sometimes copyright really sucks...