I'll ship anywhere, it is really no big deal. It will just cost you $7US for shipping these days (last year it was $3). I've not gotten a email Luka, try sending again or through this site.
My banjo is a Recording King Open back. When I changed from metal strings to Aquila the first problem was the tailpiece. The best solution may be to buy a tailpiece from Joel Hooks or some other "nylgut friendly" tailpiece . But you can make one: just a piece of thick wire and a piece of wood - or even plastic. Try to find pictures of old tailpieces - they are quite simple. I think I have read that somebody in the USA makes good No-Knot tailpieces.
Problem Number 2: Strings
Nylgut strings are thicker than metal strings, so they may slip from the grooves of the nut and the bridge. Every time a string slipped I filed the groove a little wider and deeper. If you know a luthier or somebody who knows about these things, consult that person.