Forgive me if I'm repeating a question that's already been asked, but this thread has gotten quite long

So we're doing a Monday morning at Universal, then checking into our Disney resort for an afternoon/evening in EPCOT. Due to logistics, we likely won't be able to get through the gate until 3 p.m. earliest.
Should we try for the 7 am drop and just hope they'll let us on if we arrive WAY past our boarding group? We'll likely be doing a second day in EPCOT later in the week but Cosmic Rewind is pretty much the only thing we haven't done in EPCOT, and of course it has glowing reviews so if we have the opportunity to ride twice, we'd like to try.