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There are some advantages of IR over capacitive, mainly that IR works with gloves, and avoiding one additional layer between the eInk and the eyes, thus providing better image quality (at least in theory).
Regarding your proposal, it is not so simple. Regarding IR interference, it should be not a problem as white LEDs do not emit such wavelenght, but front-lit screens feature and aditional layer that spreads the light so it get more or less uniform to all the screen.
Without such layer you will surely get the light only on the edge of the screen as there will be nothing proyecting the light to the sceen, it will travel parallel to the eInk though the upper layer of the screen.
Anyway it is worth to give a try and check the results.
I intended to try this idea on a Pyrus Mini, but never found time to do it.
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