Just throwing this out here....
MG Cycle sells 14 oz tubes of Wurth SIG 3000 for $25.00 per tube. I use Wurth 3000 on my splines and on my driveshafts, so I may use a little over one tube per year, but that is for several bikes. I don't know how much riding you do or how often you grease your splines, but I'm assuming, since you are not using it to grease your bikes driveshaft, that one 14oz tube should last you for a couple of years?
So even if a tube from MG Cycle at $25.00, and let's say that international shipping is another $25.00, then your total cost would only run you around $50.00. I think $50.00 would be little money spend for a tube of grease that is going to last you for years, and more importantly, you already like and know that the Wurth grease works.
Just something to think about.......