Can I present HD (1280x720) on an HD 1024x768 plasma, efficiently?

I'm building Keynote presentations to be displayed on HD format (1024x768 rectangular pixels) plasma displays. I have been developing the presentations in the displayed aspect ratio using 1280x720 slides. My hope was that the slides would be scaled to fit when sent to the secondary display having a resolution of 1024x768.
What appears to happen is the slides are scaled down retaining the aspect ratio and presenting 1024x576 on the displays. I don't want to try to build them squashed as 1024x768 in order to view them correctly on the monitors.

The "right" resolution is 1024x768 with pixels stretched horizontally to achieve a 16:9 aspect ratio. Unfortunately, that's not a selection directly available in Keynote.
These monitors do have a zoom mode. In "zoom" mode after some display size and position adjustments to the monitor, the presentation can be aligned to the full display.
A software solution would be preferred of course. I wonder if other presentation packages (e.g. ProPresenter) allow for these rectangular pixel displays.
Thanks for your reply.

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Can I present HD (1280x720) on an HD 1024x768 plasma, efficiently?

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