Another alternative is a 130bcd road chainset. Plenty available on eBay, cheap as chips. I'm gonna be using a Shimano Exage 500 chainset on a 107mm BB. Gives a 43mm chainline.
Needless to say the spacers on the back need to go in favour of single speed chainring bolts but once that's sorted, there'll be pleanty of room.
i don't think the stronglight chainset is a problem per se. i think that the QC of the chainset is a bit random and some may have bad tapering resulting in being too close to the stay.