To be realisitc;
As above, get the largest fuge and skimmer you can. Skimmers, cones are the latest tech on the market, I would get a good one of those (good, meaning pricey). And then the largest fuge you can, and turn it into a 'display refugium.' I am going to do this on my 240, lots of macros, some LR, some rubble, and some tough to keep fish.
If you wanted to start tinkering, the next best thing to the ocean WC idea, is to rig something up that would be more or less constantly doing water changes that's fully automated. Have it make SW in a separate container, drain the sump, then add the fresh SW.