I think Roland Rain nn Rory is absolutely wonderful! I love Roland. The spelling on Joscelind looks a little strange to me, but that's just because I've never seen it before. I like Joss, and then Jossie. Is Joscie pronounced the same as Josie? If so, I'd probably spell it like that, and it still has the letters from Joscelind.
Linnie or Jo would be great for nicknames.