Simple enough solution, I suppose.
Still, though. The lock period being shorter than the current power down period makes it inherantly less secure, for the same reasons that I stated in the first post (less time for any potential hacker to convert your account's total value to liquid Steem).
But, as I alluded in that post, there is a real, and quite obvious, security/ usability tradeoff and I lean towards a much shorter powerdown window, despite the inherent risks with that. I'd personally prefer a month powerdown (4 weekly powerdowns) over a seven day, but that's mostly because I'm overly cautious when it comes to protecting my investments, and doubly so when they're outside of my physical possession, and quadruply so when they're cryptographically secured between a network of nodes.
I can handle the frustration of having to wait an extra 3 weeks, given the peace of mind of being 100% certain that a blackhat won't be spending all of my funds before I get back from my week's vacation.