Using Timing Belt Pulleys for full court shooter

[RohitD]

Hey guys,
This might be a really simple question, so forgive me if it's common sense to some.
Our team is looking into using timing belts to drive our full court shooter. Looking at the available motors, we want to use 2 AM-9015 motors and 1 RS 550 to achieve the desired speeds (about 4000, 7000, and 10000 RPM).
The issue that I have is our team was planning to use half inch axle to spin the wheels on. The motors have an eighth inch shaft. However, I could not find appropriate timing belts to fit both of these. On McMasters, the MXL series fits the eight inch, and the L fits half inch, but I couldn't find anything that fits both.

Any ideas on how to get around this? I honestly have no idea of where to go from here...