Here’s a picture of the box and label for a clip of G. Roth 8 mm Roth-Steyr rounds. The cartridges are G. Roth 1914 manufacture as noted on the box. The only thing missing from the photo is a marking on another side simply saying “10 Stück” (10 Pieces, 10 Rounds, etc.)
I don’t know if this is the only style of box for 8 mm R-S cartridges packed on clips made in the Austro-Hungarian Empire, but if so, as the box says, they only hold one clip. You would have to buy the number of boxes for the amount of clips you wanted. I used to own, in a collection of auto pistols, three Roth-Steyrs, and I seem to recall their is a button on one side to lock the bolt back. I think if I am right, and I warn that it has been decades since I had that collection, that you should be able to simply lock the bolt back on your pistol and load the rounds one by one. However, if you try that, do something to keep the bolt back, because I forget if the depressing of the follower frees the bolt to go forward, or not. If it does, you would have a might sore thumb. I haven’t handle a Roth-Steyr Pistol in about 40 years, so forgive my equivocation about procedures for loading with no clip. I just can’t imagine a military pistol that could not be loaded and fired in an emergency (no clips at hand, but ammo available) combat situation without the clips.
God Luck! As Enfield said, getting a few clips for the Roth-Steyr might end up be almost as costly as one of those pistols.