How to export to hi-resolution image without changing size?

I have created some artwork in PowerPoint to laser engrave. The dimensions of the slide are 13" wide by 16" tall.

By default Powerpoint exports at 96 DPI.

You can change this with a registry setting:

https://learn.microsoft.com/en-us/troubleshoot/microsoft-365-apps/powerpoint/change-export-slide-resolution

However, when you do this, it changes the size of the slide.

I want the slide to export 13" x 16", but with increased resolution so that the artwork stays crisp.

Any ideas?