Instead of using two separate lines I would highly recommend using a single line that is 25' long of octo-plait or 12-plait and use a locking brummel splice in the center of it. Using this bridle reduces the number of thimbles that need to be connected to the swivel and gives you the redundancy you are looking for.
I would also recommend getting about 10' of 2" tubular webbing, preferably spectra or dyneema if possible, and cutting it in half and putting a 5' long section over each side of the bridle as chafe protection. In the future, it might be worth considering moving the existing cleats inboard a bit and adding bow chocks to the foredeck along with stainless steel rub strakes to protect the fiberglass, as I've done.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.