I have also been able to get two reps the timing is rather difficult...Doing this reliably might be a challenge I'll try and post a video of it as soon as I'll be able to. I just figured more than one confirmation of this combo working will spark more hope in it.If possible post a video up of the combo, there must be some kind of timing issue we haven't gotten then. If you can relaunch after 3b BE then it at least would be more worth it to do for other things.
EDIT: Some execution notes to help the relaunch timing for the C2B, it seems if you wait till the opponents body is around Hilde's head it makes pressing G into C2B a lot easier...though its something that is going require some serious practicing, unless you just have godlike execution that is lol. If you do it to early it will actually go into the normal animation of the BE 3B attack, too late and your C2B will just wiff all together :/