just a 5mm should clear it, have you tried seeing if someone has a set of the right SE wheels? Maybe to trade or just buy? Seems like it may almost be cheaper as little as SE's go for!
As far as spacers, I dont believe you can buy a bolt up spacer less than 15mm. (I havent seen them anyway) they generally run ~$75 a pair. Circuit sport and H&R are some of the cheaper ones. For just a hubcentric spacer, the Isis ones Enjuku sells were actually pretty decent, had a buddy run them while he wheel shopped.
The Lakes Crew