Here are gloves that supposedly fit a 6.5in circumference hand (1st link below)
If you’re still having issues with those, I would suggest one of two things
1) Consider small MMA gloves that have a uniform surface. There are still finger holes on the inside, but some will be more flexible. Also, keep in mind that these gloves are designed to have wrapped hands inside them. As long as the fingers fit, just get some extra long/thick wraps to make your hands bigger. (See second link for example of the type of glove I’m talking about)
2) If all else fails, you might look to kids karate/Taikwondo gear. They probably come in smaller sizes because kids compete at younger ages in those sports