This one is new to me - I've never seen rivets in a splash cymbal. Rides, crash rides, even hi-hats, yes - but not a splash.
If you don't mind my asking, what has prompted you to try this? Did you see someone else doing it, or did the thought just occur to you?
If I were to try this, I'd actually go buy a cheap-o splash to experiment on first, and I'd start with just one rivet, try it, and if needed add one or more from there. I also don't know if I'd put all of the rivets together, or space them evenly around the circumference of the cymbal. Maybe i'd buy
two cheap-o splashes to experiment on!
Whatever you do, please do report back with your results - it sounds like a very interesting project!