Of the boats I have on my next-to-build list,
: three are hard chined and one is either multi-chine or will be stripped and
: rounded ... Some may be a hybrid with the chines made of hardwood and the
: panels filled in with ply - haven't yet worked out if this will work out.

Andy, done that some time ago, to soften the chines in the forward half, got the inspiration after having seen a mandolin built like that. It works quite easy if you start with the chines, i added some overlap since the strips were a couple millimeters thicker than the plywood so i passed the bottom and top strips to a router to cut a notch and stripped the chines, took the shape of the ply panels later, cut them off epoxied them in place and was done. On the inside i just planed a corner in the couple millimeters i had on the strips lap so that it wouldnt bug me glassing but if you want you could fillet that little "step" with epoxy and microballoons (am i calling that stuff right in english?).
It was a really fast thing and i preferred it to wire a S&G and fillet the panels actually, i plan to build a S&G this winter and ill probably go that way again. If you use a design where the plywood its really tortured then it could force the strips a little too much though, so take that in account.
If you calculate things from the design stage its easy to prepare the forms with a consistent width chine (i used 6 strips per side without having to go crazy changing the width of the strips along the hull) and place the notch to allow the strips to sit deeper in the form edge. But once i was working on it i realized that its quite easy to work all that while building, skipping all the design planning thing.