They don't enforce the spark arrestor rule, 90% of the bikes there don't run them. Get stopped for being a jack ass doing something stupid, then yeah the rangers will start righting tickets for anything they can....Make sure your bikes are registered! You need to display it also on the bike somewhere. In AZ we have "rv" plates that we use..Not sure if Oregon uses plates or stickers? Just make sure It's displayed and visible on your bike.
Think about riding at Buttercup too for one of the days. It's literally right off the 8 and the dunes are right there where you park. There's no riding a couple miles to get into the dunes, they're right in your face...It's not nearly as big as glamis but that's actually what a lot of people like about it..It's not so big where you worry about getting lost or having issues breaking down waaay out in the middle of BFE...I mention that because It's just the 2 of you and your not familiar with the area (I did see you have gps though)
I am partial to Buttercup, been going there for over 20 years..Our whole group prefers buttercup. We'll hit BC for 3 or 4 trips then the next trip camp across the hwy at Gordons, just for something different, then the next several trips are back at BC...I just like the way the dunes flow on the southern side, we're always in the "good" dunes, the only rutted up stuff is right in the main camping area.
Which ever area you ride is going to be Badass! Just throwing my opinion out there.