Probably won’t work in Lx5 mode because the CEA spec is quite unflexible, and there doesn’t seem to be any modes for higher pixel clocks/resolutions on your display.
You could try to match the pixel clock, but I highly doubt it would work. For SNES, that would be a H.Samplerate around 1887, if you then set H.Active to 1440, H.Sync & H.BackP should be around 120 & 240 respectively.
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