Unfortunately, I don't think it is possible. I just looked through the manual for the ES6800, and there's nothing in there about using any sort of keyboard with the TV. There is no bluetooth listed either, and although it has 3 USB ports, they seem dedicated for use with media devices (thumb drives and such).

Even for TVs that do support keyboards, Pierogi probably isn't going to be able to emulate a remote keyboard. Most manufacturers are simply not choosing to use infrared technology for that purpose. Radio frequency interfaces (like bluetooth) are the fad for keyboards these days...