I use a steel ring to open beer bottles, works perfectly, and I have it (literally) on hand at all times. The ring is also useful as a “hard thing” to knock in windows or on doors, inspect materials (is this plastic, pottery or glass) and cracking eggs (boiled or raw). I don’t mind the way it looks either but I mostly got it for it’s utility.
Sabrage is not that hard, you can do it with a chefs knife (use the blunt side) and a beer bottle. I really don’t want to go experimenting with a champagne bottle just to say I did that once but if someone ever wants me to do it (on a bottle I did not buy myself) I’m definitely game. The trick is to slide the knife/sabre along the seam in the glass until you hit the crown, it takes a little practice but I’ve helped some drunk people do this (on beer bottles) and most succeed within 2 or 3 strikes.
I can recommend both as nice party tricks