Talk to Henry Sharp - he's the farm just off Rt 1 where it crosses the Broadkill, and is west of the Steamboat Landing Ramp. I've known of guys that store their boat there and use his boat ramp for the season for skinny money. I hear he is very approachable, and a very nice guy who is used to people asking for access to the Broadkill... I used to hunt there years ago, but it was arranged through someone else and I never really had the opportunity to meet him.
As for getting up to Milton.... Well, I've run my duck boat up there quite a bit and it's always ok. My fear for you would be submerged logs - that can change by the storm. I would take the first run up fairly slow, until you get the lay of the land.
I'm Paul's friend Kevin - I just talked to Dave the other day when I got my oyster license, he's doing well. From what Paul tells me, you're not missing Delaware...