Is it possible to shoot in HA1920 mode but convert the HA output to HG or HX on a PC? How?

With my Panasonic HDC-SD60 I usually need to shoot differing qualities. Ideally I'd like HA for my own use and so I can get the best possible conversion to MPEG-2, but a lower HD quality to load to YouTube. Is it possible to have the best of both worlds and set my camcorder for HA1920 output but run this output through a program which outputs HG, HX, or HE? How?