I don't understand the fuss. 130 is darn easy to mix; and glycin powder itself is no more scarce than many favorite films and papers, which also slip in and out of inventory and require strategized or timed purchasing. There nothing "troublesome" about glycin as an ingredient at least. Buy a second bottle and keep it in the freezer to tide you over if there's a temporary scarcity. Same thing as I do with film.
But I can appreciate the predicament of John in Melbourne, where certain supplies might be awfully expensive to ship in. There is, sadly, no work around for glycin if you want to replicate the specific look of 130 with its subtle highlight stain. But, depending on your preferred paper, there might be some other formula which is acceptable in its own right.