Since Hollywood Studios pretty much always opens at 8am (or sometimes earlier), and you'd probably want guests to have a good two hours at Batuu at least, that would mean a 6am arrival for all of the guests at the hotel.
I just don't see how that would work, for one thing since you take a "transport" off ship it's going to take time to ferry all guests over.
For another thing, if you really want to see some heated Resistance action, try telling luxury hotel guests they have to be totally ready to do anything before 6am!!
Same goes for hours after park closing (8pm), they are I think a bit too late to really suit luxury hotel guests. And like you said there would be people lingering past 8pm anyway, so you may as well send the hotel guests in at some reasonable time.
That's why after some thought I am pretty sure there will be different groups from the hotel sent over in waves through both days of the "flight", and given special Fast Pass Supreme Leader passes to ride both MFSR and ROTR with no wait. I personally don't see the objection to mixing with normal park visitors and honestly it would be a better experience anyway as part of the fun of Galaxys Edge is seeing other people's reaction to Batuu.
Plus imagine how cool it would be to be in Batuu and hear that a transport from the Halcyon had just arrived, then see a bunch of thematically dressed people emerge from a transport bay... Could be the transport ship exit is beyond one of those giant doors you never see open.