Without putting my hands on it I cannot be certain, but it looks like simply changing the latch location on the hinge would take care of the issue. There are many ways to accomplish this.

The easiest would be to use a hack saw on the hinge piece that is attached to the window; cut 3/8" up the tab that supports the hinge pin. Cut the old latch tongue off and then bend in a new latch tongue from the remaining stock created by the first cut.

If you can visualize what I am saying, and have the tools, I would say it would take ten minutes per side of each window.

If what I am saying doesn't make sense, or you don't have the tools... Then I would take some more pictures and find a local machine shop. Then take one hinge (both pieces on one side) to the machine shop, show them the pictures and explain what you need done (i.e. reduce the latch angle). They can easily either fabricate new hinges, or modify yours. If you are not in a hurry, then let them know that they can work on the project at a slow time and that might save you some money.