Yes, I did this last fall. We had 100 developer's points and wanted to use all of them. So it worked out for us to stay in an SSR studio for 4 nights, then move to an SSR 1 BR for the last 2 nights. It wasn't too much of a pain, but I don't want to do it again. I found that split stays aren't for me. One recommendation is to stay in the studio first. You will have the 1 BR to look forward to, plus you'll have more room for your souvenirs. Another suggestion--if you have enough points, stay less days in the studio than you do in the 1 BR. It's easier to move after only a couple of days as opposed to several.
Actually, I said never again, but I'm planning a split stay at AKV next year. I hope to get a Saturday night concierge studio then transfer to a Kidani 1 BR Savanna View for the next 6 nights. I don't think it will be a big deal since we're staying only 1 night, then moving. We were going to stay at Comfort Inn that first night, but have some extra points so thought why not? That's the only reason I'm doing a split stay though.
Good luck with your decision!
They move your luggage for you and you need to be out of the room by the regular check-out time. You can request to stay in the same building. 
