Hmmm.. it might be a bit of a pain, and return from hurghadha usually has the last flight leaving hurgh to Cairo at about 3:40pm so it can be a long layover in Cairo if your flight is late night.. I’m also not betting there are going to be any reliable quick flights to Luxor from hurgh at the moment and for the next 12 months... taxi from Luxor to port Ghalib would be an utter pain in the ass. I would likely just do the return cab from hurgh which isn’t as bad ( 3.5 hours) and you can arrange to get to Luxor before dawn to get a full day. Then I would shore dive from the breakers or the kempinski and try to do a day trip to the panorama reef/Salem express wreck and a couple of zodiacs to tobia arbaa etc. Orcas dive clubs are onsite at the breakers. Great dive outfit. Great shorediving and some of the sites the liveaboards do as well.
The issue with taxis is that you ain’t getting any Escalades which anyways annoys me. It’s usually a completely beaten up Nissan sunny etc