Need to control UHF Dish tuner 2 from TiVo which only emits IR

What I need to do is control tuner 2 on dual tuner Dish boxes from my Tivo and/or my LG LRM-519. Both TiVo and LG use IR emitters to change channels on Dish boxes. I have the Dish dual tuner box set up have each tuner viewed separately through its two separate outputs. This one of its options, referred to as dual mode.

I want to use two separate TiVos or the LRM519 to separately control the two tuners on the Dish box. I can receive the separate signals from Dish tuners to TiVos just fine, the only problem is changing the channels on Dish tuner 2 using TiVo. Tuner 1 on the Dish box responds just fine to the IR emitter cable from a TiVo. Tuner 2 on the dual tuner Dish boxes like 322, 625, 722, will only respond/change channels using Dish's unique UHF/RF remote control, and won't change channels using the IR TiVo emitter.

So I hoped there might be a product that would convert the IR signal from TiVo's emitters to the UHF/RF type signal used by Tuner 2 in the Dish dual tuner boxes.