Fuel bladder

Absolute and Dave are right. That's the best way to handle your problem.

I had a 30 Gal tank below deck with no baffles and never noticed a problem. In an old boat we had a 40 Gal Hot water tank athwart the Fwd Deck.
No baffles in that one either and no noticeable problems with it either.

Maybe they make an inflatable bladder with inflatable baffles?
 
Aircraft fuel bladders have clips which suspend the bladder within the wing to prevent collapse. You access the clips though various inspection panels in the wing. Even if you could get someone to make you a bladder, it would be dangerous because in the event of a leak, it would leak into the old tank, which would leak into your bilge. Oh, and aircraft bladder do have baffles.
 
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