I'm not so sure. Gamora you can easily make the case of the soul stone somehow bringing her back and saying that by thinking he killed her it fulfilled the wishes of the soul stone . Loki is Loki. Heimdall I'm pretty sure is dead especially with them giving Thor's Ax the bifrost power. No need for the later if Heimdell might come back. Vision is a big question mark.
Wouldn’t Thanos have brought her back once he got all the stones then. I don’t think he or the guanlet can. Some of the deaths are going to stick. If they reverse the snap, which I think they will, it makes sense that pre snap deaths are permanent. If not all the worlds he destroyed pre gauntlet could also be brought back.