An above-deck livewell built into the transom would sure be nice, no question, and I, too, love that aerial view picture (all the teak's nice, too!). Just being able to get rid of one more pump (the drain pump) would be a pleasure. Who wouldn't want to simplify life a little? Plus not having to grope on your knees for frisky blue runners and gogs that really don't want to go into that little net sounds like pure heaven!
I guess if you were game to do that kind of project fitting it into the transom PLUS a little extra work, you could relocate the chair backing plate closer to where you'd cover over the old in-deck livewell. That would give you clearance. There's no prob on a 45c Ser II with room fwd of the chair, at least the kind of inches we're talking about, anyway.
I wouldn't recommend removing my type of livewell completely, btw. It probably was engineered in as an integral cockpit sole reinforcement, seeing as how it goes all the way to the bottom; you'd at least prudently want to rig some kind of bracket supports, I'd think.
-- Paul