You're looking for one of the unicorn buses. I'm told they're out there. The medium size rear engine (RE) buses, not the unicorns.
You don't want a 40 footer, so possibly a front engine (FE) bus would work. It's much easier to find a medium FE bus. For example I have a 26" Bluebird FE that is amazingly maneuverable. There is an engine housing hump near the front entry door. Some of us don't mind listening to the engine while we're driving.
We've, on this site, had long debates about who has the most floorspace in FE or RE buses. It's a little like comparing apples and oranges, but we each have our preferences.
The dognose buses will be more comfortable for a newer bus driver because of the more normal location of the front axle, but the FE or RE buses will get you more floorspace with a slightly different driving experience.
Good luck.