I frequently alternate the two but rarely if ever use them on the same day, at least not on a high intensity day. I don't see much reason why it couldn't be done but I don't really greater benefits coming from splitting it up over two days.
Flight and star, what's the rationale behind the combination / superseting of the two lifts in the stated intensities?
As a side note, unless you're very strong in the lumbar area I wouldn't push around limit weights on good mornings. The risk-reward ratio is not in your favor.
I don't like going heavy on good mornings. If going heavy and you break form at any point there is a real risk of injury and the bailout is a nightmare. But, they do seem to heat the glutes harder. So we sometimes do them after the RDL's. We also superset them, sometimes after sometimes before. When done before, it's in an effort to pre-exhaust the glutes before the RDLs.
Normally, they are done on seperate days, with the RDL's done on ME days, and the GM's done as an accessory after DE squats.