You could number them "manually" after the project is finalized.
By manually, I don't mean add each number to each page individually! LOL.
I mean, make a text file with your numbers in individual paragraphs, "1
^p 2 ^p 3 ^p etc." ... then flow the text into a layer on your
right-hand page, so that each paragraph starts on the next page via a
par.style attribute or just the size of your threaded text frame.
You would have to do this as a final step in doc prep, because otherwise
you'd have to adjust every time your page count changes.
But this way, you can number right-hand pages 1, 2, 3 relatively easily.
I'm most curious why you'd want to do this. But it's not so difficult.