howdy! while we are no experts, we do have some opinions on phals in moss!!! hahahaha.
like you, we don't do phals in moss...and our experience has been that leaving in them in moss, even for a couple months, will put them behind phals that we repot into bark and leca immediately when we get them. even if the repotting happens in mid-winter!
forget about the fact that it has gigantea in it, just treat it as any other hybrid phal and repot it once you get it if that's what you normally do.
give it as much light as you can in the winter and then move to bright shade in the heat of summer. otherwise, no need to do anything different, imho...good luck!