Perhaps post a photo and measurements. How will you get a good seal? Will you mount a Push-Tite Gasketed Closet Flange (887-GPM) or what?
I would not be surprised if there is some 10 inch offset toilet that will fit 9.25 rough-in. There are some 12 inch toilets that fit under-11 inch-rough-ins. But I don't know about the 10 inchers.
I made new holes in a Unifit and mounted a 12 inch unifit over an inch farther from the wall than 12 inches. I think you could do a similar thing and mount a 10 inch unifit closer to the wall. Note that the toilets that take Unifit plus the 10 inch adapter itself are more expensive than regular toilets. Since you are only trying to stretch by 3/4 inches, you might not have to even make new holes. But the fact is that you could if you had to. Vespin 2 and Eco Soiree are two of the toilets that work with a Unifit.