Thanks for mentioning the product that I was thinking about.
Unfortunately, MyDMX is to the best of my knowledge it's own stand-alone platform. Unless there is an "import" utility to covert a MyDMX show to aShow XPress X-Factor format. But I don't think it's just as simple as that as MyDMX can also contain(but not limited to) the following within scenes: Fixed timings, x-fade times, multiple steps(such as say circles on movers, or maybe a move of a head then snapping it full ON after ensuring the gobo and color wheels are in position). Not knowing much about the Show Xpress X-Factor, I can't speak with any authority about it.
I can say this though, MyDMX isn't going to change to accomodate that sort of functionality. Now, if you have a way to record the output from MyDMX into some sort of DMX recording device(something that would plug INTO the DMX-512 stream), then you could handle it that way. But I think the X-Factor takes the computer generated data and then pushes it into the dongle via a proprietary format(for data transfer), but then after that, the dongle is outputting DMX.