2000 205v

[sheckski]

We are ready to update our ballast and are looking for some advise on a multitude of points. Our plan is to keep the stock klb, use an extra bag in the bow with portable tsunami pump and install 2 x 750 in rear lockers. I have picked up a used electronic manifold from a hippopotamus system.
1) Stock ballast is the KLB only. The check valve has failed so once filled that bag would always re fill by siphon until the boat was removed from the water. Since the check valve slows down gpm considerably, is there a way to mange the ballast without check valves?
2) Wife threw out the klb bag by mistake - long story - I have other bags but valves are in the wrong location. Can I put on my own valves or any idea where to get that klb bag?
3) Pumps are standard bilge type pumps. I assume these should be upgraded? Suggestions?
4) For rear locker i see the pro x series 750's but these have the quick release system. How do these get hard plumbed? Should I look at other bags?
5) Do I run off of one intake and existing drian fittings or will I need additional through the hull fittings?

Thanks in advance for all available guidance.