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@Krinkels
I haven't got anything you need,
but to answer your question about a larger chainring size, 104 bcd 4 arm spiders, and *130 bcd 5 arm*road spiders that fit onto 48 spline Bmx axles (the most commonly used today) are pretty easily available. the 104 bcd will fit from 32 to about 44, and the 130 bcd obviously fits practically anything up from a 38/39
Something like this
http://www.profileracing.com/estore/product.php?productId=360
(a high end example)
Good luck!