IMO this is the best way to do it. By adding all that diversity from healthy tanks, Robs entire old sandbed in your fuge, marcos macro, and your seeded rock, you may end up with better than what you would have gotten from Tampa Bay... JMO. I think you're doing it right, you've been so patient with the whole process, and it will pay off in the long run. It's like $1 today, or $10 next month, and all you have to do is wait....
I wouldn't be so set on this idea. If you dip and QT all your corals, and QT and treat your fish appropriately, then no, I don't think you will introduce pests anyways. Talk to Marcos about this, I know he's got a strict regiment for all his corals and fish, and it looks like you're already looking into it. I think a lot of people worry about fish introducing problems, and tend to forget about corals. Just remember that you can QT corals as well (and some folks will tell you ALWAYS) remove corals from plugs. Your pod population will get there, that last thing you probably want to hear is "don't rush it," but.... well, seriously, don't