Funn and
Woodman componenst both make 700+ flatbars in 25.4
I have a Madd wide trials bar in 31.8, don't know if they do 25.4. I liked the Funn in a small test in Bikepark Winterberg. Last bikes fit them to their complete bikes, notably all DH rigs on display at the Bike festival had them in in 25.4.
Enjoy!!