Quick update.
On the outbound when I checked my luggage, I asked if it was checked through all the way to LAS - and she replied yes, although it appears you're taking the scenic route to get there

So that made it easy, just walk out of airport, catch car rental shuttle, run up to hairdresser and back to airport, and not have to schlep luggage. I did clear all 3 upgrades on the outbound
On the return the earliest I can clear will be tomorrow afternoon. I did go for the 757, but in looking at what the load is there are only 2 seats in F & 3 in E for sale. So I'm expecting to be in E+ for the return. The onward short hop I'll clear the F no problem, but given wheels up/down is only about 20-25 minutes that's not as important.
Cheers.