I use a small piece of cooper wire (without cover), which allows to make a "U" turn in one of the end, been useful for holding the stem. As it is dark, is almost imperceptible.
For me staking is essential. I like the flowers facing me, arranged well and held above the foliage. So I put a lot time and thought into staking. Good presentation rarely happens by chance.
I use galvanised wire myself. You can bend it to shape and cut off bits that are too long.