Can't you just Learn the Live TV command from the original Tivo remote's Live TV button ?
Randy URC MX-890, MX-780, MX-450, R40, MX-500, Sony XBR-55X900E, Panny TC-P55ST60, Tivo Roamio Pro & Premiere & OTA, TWC Arris DVR, Onkyo 333 AVR, Roku Express 4K, Panasonic Blu-Ray