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You can always gut an old crappy keyboard, then find which two wires (row/column) to short to send a PgUp or PgDn. You can get some plywood/cardboard/whatever and with some switches make your own foot pedal.
If you get something, please report what codes it does/can generate and whether it generates down/up on a press and nothing on release or whether it generates a down on press and and up on release. You can check that all out using UsbMode.apk (in my sig).
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