[Christ]

Have you considered pressing the two parts of the hub apart and checking to see if the bearing/spindle of the Insight would fit in the race of the CRX?

If it's too big, it might be better off to just take it to a machine shop and tell them to match the profile of the CRX's spindle, so you can just press it in and be done, still using the Insight axle.

Although, if the axles are the same length or really close, you may just be able to swap the ends from one axle to the other, if the splines on the shaft are correct for the "other" CV end.