Whisker biscuit makes a bowfishing biscuit. I believe it has stiffer bristles than a regular whisker biscuit. You might be able to just swap them back and forth.
I'm not familiar with the standard biscuit, so I honestly can't say if it will work for bowfishing. Sorry! []
That nova will work,keep in mind that bowfishing is rough on a bow,it is layed around in the boat,you will be dropeing it some times in the heat of excitement,it will get roughed up,try out the Flipper rest,only $10.00,and lasts a long time,and has nothing to hang up on,
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You cannot be a winner if you do not compete,
Or, you could just forget a rest and shoot off the shelf. Infinite possibilities. just lighten up the poundage for bowfishing or you'll wear your arm out.
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Personal worst - 20# silver in the nads.