Thanks for the tips!
I ordered the Lewmar, which also has a sliding bolt channel in the track.
I'll be figuring a way to fabricate some support for the track ends to extend the width of the system to keep from losing too much travel. A block of teak on either side of the hatchcover perhaps. It looks like there's plenty of room.
As for bedding, I found a soggy chainplate bulkhead this past weekend... the pre -launch list just got a little longer.