Ok, a few things here:
1) A room is going to cost about $319 a night. This is for four adults and 1 child.
2) The room keys have each persons name on them and you are not allowed to share them. They do look at the names and dates on the room key, so if a female shows a room key with the name Josh on it, they might not let you go.
3) Why not stay at Universal? If you are going to be paying so much for the room, it would be a better idea to stay in the room and cancel your offsite hotel. From what you said, there will be more than one family going, but a total of six people. I would assume that each family has a different hotel room. So, if one family had two adult and one kid, the price of the room would drop to $269 a night.
If only YOUR family is thinking about getting the express passes, I do not think that will go over very well with the rest of the group. They will have to wait in lines while you can skip them all.
Basically, it makes no sense to pay for two hotels room each night. Either way you are going to be spending a lot for the Universal one, so why not STAY there and save some money by not staying offsite? Plus, you will not have the long walk from the parking area to the parks each morning. In July, IOA opens at 9am. So, for hotel guests thats 8am. If you plan on staying offsite, you need to plan on arriving to the parking area around 7am so you can do the long walk to the park. If you are staying at the hotel onsite, you do not need to get up as early since the park is right there.