there are a ton of ways to do it,

so to determine which way, a few questions -
1) can you put a shallow groove in the hub of the wheels? or are they plastic. if so try the method i described earlier, works 100%

2) how wide are the wheels? - if they are thin. try putting the wheel on the shaft, then the chuck over it and tighten it up, there *may* be some slippage but it shouldnt come off.

if you get a bit restless with other methods you can buy 95mm wheels that will screw straight on the shaft with no trouble at all.

you may be able to make a plug to go inside the wheel??