Your not going to have a lot of luck with different options for a 25.4mm (1") clamp size. Thats an old, old standard. 31.8mm is the new standard, and before that 26mm was the standard. Your going back 2 generations for road bike bars to have a 25.4mm clamp size.

At 25.4mm try a set of traditional curved bars. Otherwise I suggest that you need to change stems unfortunately.

Anthony