That would be great, and I hope that even though September is low season, they will keep enforcing it - but it seems to me that the walk from across the street would be about the same as the walk from BLT to the MK bus depot, so in this case, I still think the depot is the best plan too. I really prefer to drive to DTD from BW, but it's so hard to get a parking space if you stay out very late that I just quit doing it.
OP, pay attention to the park hours for MK and DHS if you take the bus. If you're dining late, you'll need to know if the parks are open late enough for you to get a bus connection back to BLT. If not, you could end up having to take a taxi. Just something else to throw into the mix!