I totally get it; I also need a separate space to switch mindsets.
Your setup reminds me of an article I read many years ago on these sorts of "tricks" to stay disciplined when working from home. One of the tips an individual used was to
1. Walk out his front door
2. Lock it
3. Walk around the block
4. Re-enter the house
And he was now in "work mode". At the end of the day, he reversed the process by walking around the block in the opposite direction in order to "get home".Seemed quite brilliant to me at the time.
edit: Just noticed that enraged_camel engages this exact technique below.